Just do a Google search of "AVG version 8 problems", or something to that effect... I can't remember exactly where I started to read of people having problems...
You could also go to the AVG forums, where they announced the extension of the support deadline...
If you don't want the link scanner in the browser (which does slow it down), you have to install AVG from a command line prompt with switches to disable that portion (I found this gem from someone else that posted it was buried in an FAQ somewhere).
All I know is that prior to version 8, AVG was largely transparent, after installing ver. 8, it was getting in the way--so I went with Avast as a test, and it seems to be working fine.