Are you sure it is actually working. After thinking one was working years
ago, I have taken to keeping a live virus on a floppy, but you can also use
the universal test virus, just to make sure, especially after any error
messages installing it.
I am also running the free version on build 5384. You have to download the
latest version of Free AVG. I installed it after being current on all of the
vista updates but I don't know if that is necessary or not.