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Windows Defender Offline Scan - Reboots but does not perform a scan

Anonymous
2018-05-23T07:38:44+00:00

I am trying to run the Windows Defender Offline Scan.  However, it does not work.  I have run sfc /scannow and dism restorehealth and no issues were found.  The steps to reproduce:

  1. I run the Windows Defender Offline Scan via the GUI (Windows Defender Security Centre -> Virus and Threat Protection -> Run a new advanced scan -> Windows Defender Offline).
  2. After clicking Scan now the PC restarts
  3. After the restart the initial Windows Defender scan page is shown for approximately 2 seconds.
  4. The computer restarts again
  5. This time it reboots to Windows
  6. Checking Threat history confirms no scan was run

I am running Windows 10 Enterprise.

Any ideas what I can do to get Windows Defender Offline working again.  The online scans seem to work OK.

Thanks in advance.

The following may not be of any relevance but looking through event logs I saw some DistributedCOM errors that mention the security center:

The application-specific permission settings do not grant Local Launch permission for the COM Server application with CLSID

Windows.SecurityCenter.WscBrokerManager

and APPID

Unavailable

to the user NT AUTHORITY\SYSTEM SID (S-1-5-18) from address LocalHost (Using LRPC) running in the application container Unavailable SID (Unavailable). This security permission can be modified using the Component Services administrative tool.

Windows for home | Windows 10 | Security and privacy

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Anonymous
2018-05-26T02:15:19+00:00

Hi Rob,

You don't have to accept defeat. You could try a Repair Upgrade if you wish.

That is, using an ISO to install W10 over your existing copy, while leaving everything

else in place.

http://answers.microsoft.com/en-us/insider/wiki/insider_wintp-insider_install/how-to-perform-a-repair-upgrade-using-the-windows/35160fbe-9352-4e70-9887-f40096ec3085

See this article by Andre De Costa, and see what you think. Skip the "HERE" link

for now, and skip the "Dual-Boot" link, unless that interests you. Review the article

from the Screen Shots through completion. If this looks like something you would

want to try, see the following link for downloading and using the "Media Creation

Tool". https://www.microsoft.com/en-us/software-download/windows10

I would suggest that you use the second option. For "Flash Drive, DVD, or ISO file."

Since Andre uses the ISO file in his article, that would be preferable.

Select "Additional Methods For Using The ISO File". Then expand it. Scroll down

to "Install directly from ISO. See instructions for Mounting and Using the ISO file.

Be sure to see procedure for changing the program to use for opening the ISO.

  1. Right click the ISO file and select "Mount".
  2. Double-click the ISO file to view files.
  3. Double-click Setup.exe       And the installation begins described in Andre's article.

Before attempting the Repair Upgrade, I would recommend creating a full

Recovery Drive on a USB first.

If the upgrade goes south, you will have the means to recover.

If the upgrade fixes WDO, replace the Recovery Drive. It will have the WDO

problem on it.

I tried to take as many Ifs, Ands, & Buts out of this, as I could.       Glen

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  1. Anonymous
    2018-05-26T15:46:39+00:00

    Hi Glen,

    That has worked.  Thank you very much for your help and advice on this.

    Much appreciated,

    Rob

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  2. Anonymous
    2018-05-23T13:59:50+00:00

    Hello Robert,

    Try the following steps:

    Update Windows Defender & Windows 10

    It should probably be updated to the latest version of signatures and the latest version of Windows 10, but if not, update Defender and your system.

    Windows Defender Troubleshooter

    • Press Windows Key and type troubleshoot. Press Enter.
    • Select and run the Windows Update troubleshooter. That often fixes issues with Windows Defender.

    Reset Windows Defender

    • Press Windows Key and type Command Prompt. Right-click and choose Run as administrator.
    • Type net stop bits. After pressing enter each time, type net stop wuauserv, net stop appidsvc, net stop cryptsvc. Don't type the commas.

    Doing both of these things may fix any issues. Restart your system and try again.

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  3. Anonymous
    2018-05-23T21:29:32+00:00

    Hi Robert,

    I don't mean to interrupt your conversation with Aerdian. He has given you 

    excellent advice. However, the problem you are having with WDO is just like

    one that has occurred before. History may be repeating itself.

    W10 v1703 gave this same indication after KB4025342 was installed. And

    the failure remained, through several more cumulative updates. The problem

    was resolved with v1709.

    I would recommend that you check the version and build number of your

    system. Mine is at v1803, build 17134.48. My latest cumulative update is

    KB4103721. And WDO is working fine. If yours is any later, we may be

    seeing history repeat itself.

    Regards,  Glen

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  4. Anonymous
    2018-05-23T15:02:27+00:00

    Hello Aerdian,

    Thanks for the advice, unfortunately it didn't make a difference. 

    One oddity that might be related is the Windows Defender Troubleshooter.  Every time I ran it (at least 10 times now) it says:

    Download and install pending updates

    Did you know that there are pending updates for this machine?  Choose apply this fix....

    So, I do - then it says checking for pending updates, installing diagnostics, starting Bits, and then displays check for pending updates fixed.  If I got to Windows Update the normal way and check for updates it says that everything is up to date, but if I run the troubleshooter again it says there are pending updates.  So, something must be wrong.

    I get the same message every time.  Any ideas what might be causing this?  Thanks

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