A number of Windows 7 and 8.1 users are encountering problems with Microsoft Security Essentials and Windows Defender. Users are seeing their automatic anti-malware protection turned off without their knowledge and are seeing out-of-date virus definitions. The problem is happening with some, but not all, users for the past several hours. Windows 10 users don’t seem to be affected.
I just tried running a manual Security Essentials scan on my Windows 7 SP1 desktop machine and got error message 0x800106ba. I, like others reporting the issue, received a warning that my PC couldn’t be scanned and my ant-malware service had stopped.
