To be honest I’m not very hopeful of finding a fix for this but thought I’d ask anyway in case a miracle might come my way.
I went to use Microsoft Defender Offline Scan (Windows 10 Home 22H2) and it didn’t work. I’ve used it before so I know it has worked in the past, but it isn’t working now. Normally, when you click Scan Now > Scan, a dialog will open and say Windows will reboot in 1 minute; but that doesn’t happen. Nothing happens. I ran shutdown /r from the Command Prompt and the message opened; so apparently it can open. I tried to reboot manually to see if the scan would run, but nothing.
I went through the list of fixes listed here: https://www.minitool.com/backup-tips/windows-defender-offline-scan-not-working.html but couldn’t find a fix that worked. I tried running Offline Scan from the Command Prompt and PowerShell: no good.
I tried removing all definitions per the instructions, but it didn’t do anything; no definitions were removed. It returned an error: ERROR: MpRollbackSignature failed with hr=80070005. From what I’ve found, that error seems to indicate that I lack the required permissions. I have an Administrator account and I ran the Command Prompt as Administrator; so my guess is the definitions are located in a system folder somewhere which I don’t have permission to access.
I checked Exclusions. I checked Services and found two Microsoft Defender Antivirus services and both were running. I ran SFC, DISM, and CHKDSK. I don’t have any third-part antivirus software running. Somewhere I read that disabling Fast Startup might fix it but it didn’t. I believe I’ve tried every fix I could find with no luck.
From what I’ve read this seems to be a common issue for a lot of people. Microsoft Defender Antivirus works in every other respect. Anyone have any suggestions?
