I also liked AVG, had a few problems getting 8 to run, but got some advice on hereand OK.
So, I downloaded Version 9. Found that it was incompatible with Windows Defender and that even though the email (Outlook Express) was ticked/checked to check incomings and outgoings, neither of these occurred. Iwas told that it is set for Outlook only.
Have re installed 8.5 and all is working normally again.
Hopefully they will iron out some bugs so I can download and use 9 again.
I am a numpty with computers, so don't know enough to dive into its bowels to fix these things.
I am running Windows Vista Home Premium. 32 bit, with windows defender and no other firewall. Would like to go back to 9 if possible.