Best policy is also to do a full C:/users folder scan once in a while, I often find that very rewarding.

Agree. And in the vein of some of the advice above to become more adept at configuring Avast to do just what you want, I suggest increasing the efficacy of the scan. There are options in there that are not selected by default that actually can give you slightly more peace of mind - at the expense of a bit more computer time.

-Noel