Yah, I've seen sites say things like, watch this free video of Jennifer Aniston screwing a giraffe for free, just install this codec!
You do have to exercise some restraint when it comes to installing anything (sorry Jennifer), but other than that Avast is lighter and better at defending against junk than AVG in my experience.
I have a dead machine in my closet that might have a small IDE drive. I'll take a look when I get home.