Windows Defender Service stops during a scan


I'm trying to do a custom scan of the main drive and while it's into 7000 files it aborts with error message:

Windows Defender couldn't scan your PC
This progerams service has stopped. You can start the service manually or restart your computer
which will start the service.
Error code 0x800106ba

I restart the service both thru Defenders button and in Services then restart the scan and same thing happens. Reboot then start the scan and same thing. This happens on my laptop with Windows 8 and on my desktop with Windows 8 Pro. I've been trying this several times and get the abort message at different amounts of files scanned. Last time I went 78,000 files on my laptop til it aborted.

Windows 8 & Defender is up to date.

Anyone experienced this problem? Any solutions?

10 answers Last reply Best Answer
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  1. Exactly the same problem here. I haven't noticed this before> the Event log has the following messages
    Faulting application name: MsMpEng.exe, version: 4.0.9200.16384, time stamp: 0x5010a938

    These errors only started today for me. I would have though that if windows defender stopped protecting my system, a big alert would be flashed on the screen.

    Still trying to find a solution. I suspect a microsoft update, because that is all that has changed on my system
  2. This only started for me today as well. Must be one of the W8 updates or a new virus or something. I did a restore to a week ago and it fixed it but as soon as I restarted and the latest W8 update took effect it started doing the same thing. So I guess I will wait a week or two before going to AVG or?
  3. Something else I noticed that may or may not be related. 2 weeks ago I checked my restore points and System Protection was turned off and there were no restore points. I turned all that on, created a restore point and documented it in my log. When Windows Defender wouldn't complete with the error I posted, I checked System Protection and it was again turned off along with no restore points.
  4. Update:
    I restored my desktop to the first install I did. There were no updates and the definitions showed 6/18/2012. Ran the Quick Scan option and it ran fine. I updated Windows Defender and ran the quick scan and it generated the error I first described. Looks like the updated Windows Defender is a piece of garbage and I wasted hours playing with it. I wonder if Microsoft knows they sent out a junk scanner?

    Here's the good Windows Defender:
    Virus definition version: 6/18/12 @ 12:42 PM
    Windows Defender Version: 4.0.9200.16384
    Antimalware Client Version: 4.0.9200.16384
    Engine Version: 1.1.8502.0
    Antivirus definition:
    Antispyware definition:

    Here's Defender after I did a Defender update:
    Windows Defender Version: 4.0.9200.16384
    Antimalware Client Version: 4.0.9200.16384
    Engine Version: 1.1.9203.0
    Antivirus definition: 1.145.1465.0
    Antispyware definition: 1.145.1465.0
  5. I just restored from a previous image, updated Windows Defender's definitions and the error persists
  6. I think I will give it a few days and see how Microsoft addresses this issue. Scary though having a system unprotected like this. A real test to see how Microsoft responds to a failure like this on the operating system they are trying to push people to adopt, because it has good security.
  7. Best answer
    Found this on another forum and it does fix the problem.
    Quote Originally Posted by yeppe View Post
    Hi Guys
    I have the same problem with the virus definition 1.145.1483.0 but this morning with the latest virus definition 1.145.1490.0 it's all ok!!
    Please download the last update in the Microsoft site:

    Get the latest definitions - Microsoft Malware Protection Center
  8. Great find!!!!
    Looks like that took care of my problem. Nice to see Microsoft took care of it so quickly. Here's the new Defender info. Looks like just the definitions changed.

    Windows Defender Version: 4.0.9200.16384
    Antimalware Client Version: 4.0.9200.16384
    Engine Version: 1.1.9203.0
    Antivirus definition: 1.145.1493.0
    Antispyware definition: 1.145.1493.0
  9. Best answer selected by gb777.
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