Yes, msconfig is a useful utility for blocking startup programs that one has installed, but really didn't want to run. The folders you mention are where those two files reside on my SP3 computer. You can also submit them to an online scan. These guys, and others, provide that service.
http://www.kaspersky.com/scanforvirus
Or just copy them onto a flash drive and scan them with one of your PC's.
Who knows, maybe they are corrupted, as msconfig is on every XP PC in the world and you wouldn't expect AVG 8.0 to trip over itself. But given what I've read about it ....