I could not get on with Avast at all, hated the 'radio' type controls and all the whistles and things that came with it.
I stuck with AVG upto and including the 7.5 but after a few problems with it freezing on System restore files, I got the Avir and used that for a month or so.
Then I got the free disc with PCW and loaded Spyware Doctor with Antivirus on one machine and was really happy with it. When AVG started mucking about with popups I put the Doctor on my main machine too instead of AVG.
As there are about a dozen threads running on VNU with problems and questions about AVG 8 on 'how to' work certain things, I'll leave it alone until it is all running smoothly before trying it.
dave