Well I just got down rebooting back into Vista from a session in XP where both versions have 8.0 on and see only one problem that has been seen on numerous other occasions. That would be the "failed to connect to server" popup message.
No missing files following a full system scan in both versions following the automatic updates early this week. So I think there's some people were already having problems or something is shall we say: "down right fishy" about the whole thing?!
As as rule I've been running the vaious AVG builds since 2002-2003 and never had any problems come up with false alarms. I can't say that with other programs that will point at a legitimate MS or 3rd party software file for something installed however.
Besides Ad-Aware other programs have looked at the MS mouse file as well as main executables for other programs on. That's called the "exe factor" usually found in some type of email scanner looking for viruses while scanning attached files and files with the exe extension while running system scans.