Well, deep freeze is the best, my friends internetcafe is using it, found it very stable and hard to penetrate even though i know how to do it. Its better then Norton GoBack!.. For, antivirus, my penny goes to these 3: 1. Kaspersky (the ultimate in detecting) 2. Nod32 (the ultimate also but once any trojan virus infect the system files of xp, it cannot remove!) 3. Avast (the third best, overall its also the same like Nod32, But on user GUI its a bit hard to configure and scan)