A friend in the office tried AVG. Like most of us he didn't read the fine print before he downloaded the thing.

He started the download and it froze XP which is hard to do. Startled, he rebooted the machine and things were fine. Thankfully no trace of AVG.

A bit belatedly he read a little and discovered that the free version was designed only for stand alone computers. Networked machines, even simple peer to peer, must buy the premium version.