Not being able to play Fallout 3 is an unreal bad beat.
Edit: Maybe try to pick up a real cheap XBOX360? That game was a lot of fun. Plus, 360 can play the suite of Bethesda games, Morrowind, Oblivion, Skyrim, New Vegas.
As for games your comp might be able to run: Braid, Papers Please, Spelunky
edit edit: Fallout 1, 2, and Tactics?