My computer is very low-end.
768MB of RAM (256 + 512 RAM))
Intel Celeron 2.70 GHZ
Intel 845 64mb Shared (Integrated, no Shaders)
Windows XP Professional SP3
But yeah, Suggest anything really. I have:
Doom 1/2/Final (TNT and Plutonia)
Hexen + Deathkings, Heretic
Quake 3 Arena + CPMA
Peggle Deluxe + Peggle Nights
Powder Toy
Age of Empires II + The Conquerors
Half Life + Blue Shift and OpForce
Minecraft (Very low FPS, not playable)
Blockkand
Tyrian 2000
Empire Earth + Art of Conquest
http://steamcommunity.com/id/coolioprofile/gamesThose too, but I can't run most of those games.