1st you could have continued posting in the other thread, no need to start a new one.
2sd ...yeah your problem came back because
it has nothing to do with Avast. That's a known issue in Windows Seven, your profile is wrongly "tagged" as corrupted by Windows and you're prompted to create a new one. I've seen this happen tens of times shortly after Windows Seven was released, but not anymore for months now, most likely due to a couple of updates. I suggest that you check if your Windows install is fully updated, that's all I can do for you

3rd BSODs are another thing, if you got memory dump files, I suggest you upload them to Avast ftp server ftp: //ftp.avast.com/incoming/