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For the past few days we've been getting the following error on our machines at home:

Application failed to initialize: 0x800106ba. A problem caused Windows Defender Service to stop. To start the service, restart your computer or search Help and Support on how to start a service manually.

A quick search lead me to this post by Paul Wu regarding the Windows Defender error. It turns out that Windows Defender is out of Beta and a new version is available. Simply follow the instructions on Paul's post and install the new version of Windows Defender and you're golden.

I agree with Paul, this was a terrible error message. The whole point of Windows Defender is to make it easy for home users to protect their machines without having to bog down in administrative tasks. Most home users could not care less what a service is, let alone how to figure out why this particular service is now failing.

Anyway, it's easy enough to fix, once you know what the issue is. 

Thanks Paul!


Currently listening to: So Says I - (02:49)
The Shins, Chutes Too Narrow

Posted on Tuesday, January 9, 2007 12:16 AM Security and Cryptography , Microsoft | Back to top


Comments on this post: Windows Defender Service Failing

# re: Windows Defender Service Failing
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Annoying problem, quick and easy fix. Thanks.
Left by Nick Holt on Jan 14, 2007 2:29 AM

# re: Windows Defender Service Failing
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Get faile to open message Ox80016ba How do I fix it????
Left by Margaret Hodges on Jan 14, 2007 7:47 AM

# re: Windows Defender Service Failing
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Application failed to initialize : 0x800106ba. A problem caused windows defender service to stop -
How to Stop this problem & why this problem caused
Left by Kannan on Jan 14, 2007 8:06 AM

# re: Windows Defender Service Failing
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Margaret/Kannan,

If you read the entire post above, the instructions to fix this issue are right there. Basically, click on the link to install the new version, follow the instructions and it will fix your problem.

Good luck.
Left by Peter on Jan 14, 2007 9:34 AM

# re: Windows Defender Service Failing
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Does this problem affect internet access? I can get Outlook emails but my Firefox browser is acting wacky. My Google searches time-out. Is there any connection here?
Left by Jason Doughty on Feb 01, 2007 6:40 AM

# re: Windows Defender Service Failing
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Hi Jason,

This issue should not affect your internet access. Defender is only really a spyware scanner. Unless in the time that it has been failing you somehow managed to pick up some spyware which is now causing your system to act funny. I guess that's possible.

The first step you should take is to follw the links in the post above and install the newest version of Defender. Once that's done, run a complete scan and see if it picks anything up. If not then you'd have to drill down to the problem further, but that should at least eliminate the spyware angle.

BTW, you should always have a firewall running (XP Service Pack 2 has one by default) and scan for viruses every once in a while.

Good luck!
Left by Peter on Feb 01, 2007 7:38 AM

# re: Windows Defender Service Failing
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It's my ISP - Arosnet. Kill my landlord, kill my landlord.
Left by Jason Doughty on Feb 01, 2007 11:57 AM

# re: Windows Defender Service Failing
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If coincidentally am without internet access, how do I follow the instructions on Paul's post and install the new version of Windows Defender? I don't know if the Windows Defender error is blocking my internet access, but I suddenly have no internet access.
Left by Clyde on Feb 04, 2007 12:00 PM

# re: Windows Defender Service Failing
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I am sending this from my computer. It's my wife's computer that is experiencing the Windows Defender error and is without internet access.
Left by clyde on Feb 04, 2007 12:02 PM

# re: Windows Defender Service Failing
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Hi Clyde,

That was the first thing I thought. If you're without internet access, how are you seeing my blog?

Anyways, what you can probably do is follow the "install the new version of Windows Defender" link above using your wife's computer. You will need to validate that Windows is genuine by clicking on the "Continue" button. Once that is done, click on the "Download" button and save the .msi file somewhere on your wife's computer.

Transfer this file to the computer which is having the issue and run it there. It should install the updated version on that machine.

I don't know if this will fix yuor connection problem however, but it's worth a shot...
Left by Peter on Feb 04, 2007 2:13 PM

# re: Windows Defender Service Failing
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The big problem with Windows 2000 and defender is the program will not uninstall. The only way I was able to stop the annoying "0x800106ba error" was to delete c:\program files\window defender\msascui.exe but the program is still there and I don't want to mess up registry so there it will stay until I upgrade.
Left by Tim Murray on Feb 06, 2007 3:58 PM

# re: Windows Defender Service Failing
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You are welcome, Peter. ;-)
Left by Paul Wu on Feb 14, 2007 9:02 PM

# re: Windows Defender Service Failing
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Application failed to initialize : 0x800106ba. A problem caused windows defender service to stop ...
Left by Milad on Feb 23, 2007 3:45 AM

# re: Windows Defender Service Failing
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where do i find paul wu's posting with the fix to the windows defender problem
Left by holly on Apr 27, 2007 4:59 PM

# re: Windows Defender Service Failing
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Holly,

Paul's original post is up there in the link called "Windows Defender error". He basically points you to the information in the page I link to about installing the newest version of Defender.

Hope that helps,
Peter
Left by Peter on May 02, 2007 11:30 PM

# re: Windows Defender Service Failing
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I am getting that annoying "Windows Defender error" that a problem caused it to stop. When I restart, I still get that messge. How do I start this service manuually?

Thank you,

Cinsy
Left by Cindy on May 07, 2007 7:00 PM

# re: Windows Defender Service Failing
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Hi Cindy,

The best way to resolve this issue is to click on the "newest version of Windows Defender" link in the original post and update to the newest version. This way the service is still running (which is what you want to happen) but you don't get any more error messages.

I'm not sure about the services since I no longer have Defender on my machine, I am now running Windows Live OneCare, which is really good except for one nagging problem I will be blogging about soon.

If you REALLY just want try to find the the service to run manually, try the following:
Note: You need administrator rights on the machine to do this.
1. Click on Start | Control Panel | Administrative Tools | Services.
2. Scroll down the list and look for Windows Defender.

If it is in the list it will probably have the Startup Type set to Automatic. In order to change it:
1. Right click on the service and select properties from the pop up menu.
2. Change the startup type to Manual.

Next time you reboot, the service will only start up if you go into services and start it.

Just to recap, I don't recommend you do the above, it's better to just upgrade to the newest version of Defender.
Left by Peter on May 09, 2007 1:18 AM

# re: Windows Defender Service Failing
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erreur 0x800106ba.
Left by blancke on May 09, 2007 7:33 AM

# re: Windows Defender Service Failing
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I can't bypass Windows Defender Service when I boot up my computer. It is completely frozen. How do I bypass Windows Defender or open in a safe mode to use Windows?
Left by Rachel on May 20, 2007 2:22 PM

# re: Windows Defender Service Failing
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Hi Rachel,

Most computer systems allow you to boot in safe mode if you hit F8 (or sometimes another Function Key) when you first boot up. Give this a try. Once you log in, you can install the newer version of Windows Defender, which I link to above.

That should take care of the issue and allow you to log in as normal.
Left by Peter on May 24, 2007 10:32 PM

# re: Windows Defender Service Failing
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i did the suggestion on the above Paul sugested to get the version howeve I daowload it and then when I ran it it will tell me that windows defender is part of Vista and does not install it.
Left by mario on Aug 02, 2007 4:28 PM

# re: Windows Defender Service Failing
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how do I get Paul"s solution and how do I get Paul and who is Paul?












h
Left by william sheely on Aug 10, 2007 4:33 AM

# re: Windows Defender Service Failing
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Hi all,

If you have this issue, just click on the link up at the top of this post that says "install the new version of Windows Defender" and follow the directions from Microsoft's page.
Left by Peter on Aug 10, 2007 4:41 AM

# re: Windows Defender Service Failing
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windows defender service failing
Left by Royce A. Henry on Aug 15, 2007 11:22 AM

# re: Windows Defender Service Failing
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0x800106ba. what does this mean & what do I do to fix it? I re started my computer & it still comes up
Left by Loretta on Aug 20, 2007 11:34 AM

# re: Windows Defender Service Failing
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Hi Loretta,

It means that you have an old version of Windows Defender installed on your machine and need to upgrade to a newer one (it's free).

Please read the post at the top of the page and click on the link that says "install the new version of Windows Defender".

Follow the steps to install the new version and you should be OK.
Left by Peter on Aug 20, 2007 11:48 AM

# re: Windows Defender Service Failing
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I've followed the steps that were recommended, however, my computer keeps rebooting (3-4 times) AND I still get the error message.

What else should I do?
Left by Wendy on Aug 25, 2007 2:43 PM

# re: Windows Defender Service Failing
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When I try to install Norton 360 which requires to remove Windows Defender, my beta version of Windows defender can't be removed. The message says "the action is only valid for products that are currently installed". I checked all areas, but I could not manually, entirely remove that beta version even I reinstall new Defender, then uninstall it successfully, but the beta version is still there.
Left by Dawson on Sep 10, 2007 2:25 PM

# re: Windows Defender Service Failing
Requesting Gravatar...
PC or somethink stop Windows Defender.msi to run and download windows XP security updates (kb931784),(kb890859).

lp izi
Left by izi on Dec 29, 2007 8:49 AM

# re: Windows Defender Service Failing
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Hi every1,
I downloaded the newest version of windows defender and i have a genuin windows xp media centre edition copy on my computer and i am still not able to install windows defender on my machine...
when the installing process is almost done an erroer message saying that service failed to start pops up and gives me the option to retry or cancel!
any useful tip?
Thx.
Left by Ozy on Mar 31, 2008 9:48 AM

# re: Windows Defender Service Failing
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Hello again...
looks like i found the solution for this issue...

CAUSE
This issue may occur if one or more files on the system are not correctly registered.



SOLUTION: remove windows defender then do the following:


1. Click Start, click Run, type regsvr32 Softpub.dll in the Open box, and then click OK two times.
2. Click Start, click Run, type regsvr32 Mssip32.dll in the Open box, and then click OK two times.
3. Click Start, click Run, type regsvr32 Initpki.dll in the Open box, and then click OK two times.

and then reinstall windows defender again..
Cheers!
Left by Ozy on Mar 31, 2008 10:15 AM

# re: Windows Defender Service Failing
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I have the same annoying problem and for some reason it is not letting my Warcraft game to start. It says "check if cd is in the cd-rom and click retry" but it won't initiate the game. I will try this solution and let you guys know if it worked.
Left by Azhar on Sep 15, 2008 12:45 AM

# re: Windows Defender Service Failing
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its so easy....You have Trojan name DNSChanger.gen!!
and this is what you should do for Vista PC
1. download SuperAtiSpyware free edition (for free)
2.Unplug out your net conection cable from PC
3.right click on My Computer......click Properties....in left site of properties panel click on System Protection........it open new Panel...UnCheck- C:System box....you got question panel were you must click over button "Turn System restore off"!!! (so you clean All old backup file were the Trojan is)
4.Run SuperAntiSpyware program....and after 10-15 min..you are asking to restart PC....
Restart PC and Plug in Net conection cable...
Next do win update and win defender update....everyting will work fine...
In the mean time ...Follow again prosedure 3......this time Check -C : System box ( so to make shure your System restore is working again)
Left by lops on Feb 15, 2009 2:34 PM

# re: Windows Defender Service Failing
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I installed Glary Utilities and played around with it a bit, eventually using the "Registry Defragmenter", stupidly without creating a system restore point. Immediately after the automatic reboot, I received this error. Many other things have gone wrong as well, Trillian (basic) had to be re-installed, I had to manually replace an essential Photoshop and Illustrator file which simply disappeared, my antivirus' real-time protection is broken, all of my personal settings for all programs seem to be gone.

Anyway, I've read everything I could find about this and tried all of it. Nothing has worked. When attempting to re-register DLLs as per a Microsoft KB article I discovered that all the following either "could not be loaded" or load but "the entry-point is invalid": gpkcsp.dll, wuaueng1.dll, Browseui.dll, msxml2.dll, msxml.dll, Mshtml.dll, sccbase.dll, initpki.dll,
Shdocvw.dll, Msjava.dll, slbcsp.dll. Some are simply missing from system32.

I just want to fix these errors and disable Defender permanently.
Left by Jordan on Feb 27, 2009 2:24 PM

# re: Windows Defender Service Failing
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I tried the suggestion given by lops on 2/15/2009 and also by peter on 5/9/2007. After that I was able to download new definitions from the microsoft windows defender website, and the error message disappeared. Thanks for your help.
Left by hussein on Mar 18, 2009 7:39 PM

# re: Windows Defender Service Failing
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here is the fix, once you get it up and running you should be fine , if it hapens again just follow instructions below .
easy!

1. Click Start, Type Run. (You can also use Win Key + R)
2. Type services.msc
3. Right-click Windows Defender service and Click Start.

To Stop the Windows Defender application, you can follow the same steps, and Stop it.

However, if you don't want to use the program at all, change the Startup type to "Manual" from the Services Properties. Right-click Windows Defender, and click Properties to see the option
Left by frank on Apr 07, 2009 2:51 PM

# re: Windows Defender Service Failing
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I did a quick search regarding this error and started the above instructions I found that with my recent upgrade to IE8 I recieved the message. Since I had to use the alternative validationn process wasn't even halfway through when I noticed windows update was alerting me to new updates, low and behold I saw definition updates for Windows defender Hmmm and said well, let's install them... So I did. Afterwards went to start menu after closing original error on desktop and up pops Windows Defender updated and running fine. For some this may be an easier way to go rather than re-install the entire program. So just a suggestion, check for definition updates in Windows update and install them. Should resolve the issue... Good Luck
Left by Mitch on Apr 30, 2009 3:05 PM

# re: Windows Defender Service Failing
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OK sorry I jumped the gun here yes all in the above post happened, but after restarting computer error pooped up and Defender was again not on the system tray SOOO... I followed the reinstall option only to find that when I ran the installation it said that Vista already has Window Defender and that I can access program via security in control panel only to find error message pop up again. So, I'm at square one. Is windows defender not compatible with latest version of Vista or IE8?
Left by Mitch on Apr 30, 2009 3:50 PM

# re: Windows Defender Service Failing
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ok this time, in Win Vista with IE8 opened the commmand prompt, and typed and executed
the command : "net start windefend" . and get the following response:
The Windows Defender Service service is starting.
The Windows Defender Service service was started successfully! Opened windows defender and am now doing a full scan. Will do a final post if I don't get error message at startup. Fingers Crossed!!!
Left by Mitch on Apr 30, 2009 5:07 PM

# re: Windows Defender Service Failing
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ISSUE RESOLVED!!! Now take into account I'm using latest version of windows and IE8. This will END the annoying message and you won't have to start Defender manually in command prompt. Here's the definitive fix! Go to Start menu- accessories-Run Type in- services.msc press continue and you'll get a list of programs Scroll way down to Windows Defender and click on ONCE to highlight in blue. NOW right click on highlited portion and choose "Properties" on "Startup Type" you'll see "manual" switch to "Automatic" click "Apply" then "OK" Restart and error message is GONE! Win Defender shows up normally in sys tray again. The problem was I installed Mcafee 2009 and it sends Defender into manual mode so computer runs more smoothly I don't care! I want to use my Win Defender! This will resolve the issue done and done!
Left by Mitch on Apr 30, 2009 8:22 PM

# re: Windows Defender Service Failing
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I noticed the post by Frank on 4-07-09 explains the fix so you might think I'm a dummy for going through so many processes before resolving issue. I read many google posts and did different searches and found an infinite number of suggestions including many saying this had no resolution but kept trying (Persistance pays off) thing is this was the first thread I ran across when researching this error and tried Franks fix but since I've worked with PC's since Dos to Vista (except for Millenium) I couldn't correctly identify how to use the RUN feature\command in Vista Saw several threads that involved use of the services.msc fix that explained it more clearly for Vista users and that's why I explain it in previous post. Sorry DUH.. I was typing "Run:Services.msc" in the search box at start menu. In vista you don't even type run... In vista run is in "accsessories" Hope this helps alot of people because I know lots of Vista users are running into this and all the Malware, re-install, registry fixes and other adivice is apparently Bu&!!
Left by Mitch on May 01, 2009 2:32 AM

# re: Windows Defender Service Failing
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windows defender is not working in my comp.
it always mark an error
Left by enrique q. on Jun 10, 2009 11:18 PM

# re: Windows Defender Service Failing
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Frank and Mitch! I love you, thanks! your guidance solved the problem that even the people at the local HP repair center couldn't solve. Defender is back to normal.
Left by Nestor on Aug 15, 2009 7:55 PM

# re: Windows Defender Service Failing
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I have tried everything, can't install a new version because it says that it come with your Vista. Unintall udpate KB931099 off but now can't put it back on the message states that it not for your system. What else is there to do.
Left by Shirley Brown on Mar 23, 2010 12:45 AM

# re: Windows Defender Service Failing
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Application failed to initialize : 0x800106ba. A problem caused windows defender service to stop -
How to Stop this problem & why this problem caused.
have tried everything, can't install a new version because it says that it come with your Vista.
Left by Harry Dhiman on Jun 12, 2010 1:15 PM

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