Well if you upgrade your ram to at leats 1gig i would do it. AVG is awesome except for the fact that how you use the machine. if its basic stuff then avg is good for you... if you do a lot of surfing and downloading freeware stuff such as limewire/bearshare/imesh/torrents, then spy sweeper with antivirus is great. AVG wouldn't work great, but regardless i would use more than 512mb of ram. 512 on xp machines are becoming absolute! Good luck