Help, my PC can't run any decent game

[The Ghost of RubangB]

You can't run ANY decent game? Have you tried Tetris, Doom 2, X-COM, StarCraft, Civilization 2, or Day of the Tentacle?

Everybody here is more help than me with getting your Team Fortress 2 to work. But I can offer this: http://en.wikipedia.org/wiki/List_of_open_source_games