About the same time as I updated Avast free in August I stopped getting definition updates for the anti-spyware version of Windows Defender. In the past couple of days I discovered that Windows Defender was actually turned off without my permission. I also found that there was register entry that was causing this. Deleting this entry only proves a temporary measure as something keeps reinstating it. My question is does this version of avast free actively turn the windows 7 version of the anti-spyware Windows defender off or have I got a well hidden virus?