Why I can't play these games?

Hi! I have a Fujitsu Siemens: P5600, Athlon 3400+, 1GB, 2.20GHz, DirectX 9.0c (4.09.0000.0904). So I could play TF2, Minecraft as the sys req demands… But when I try to launch them a black screen comes out then imediately closes. So i tried Garry's Mod, the game started to menu where i could change settings and stuff but when I start new game it loads until "initializing game data" than black screen and closes(didn't buy any of these games). In Device Manager the display adaptor says: "fujitsu siemens computers sis761gx onboard graphics", and I tryed to update it but it says that it didn' found better version than i have, and I even tryed to install an nvidia display driver, but failed.

This is an old machine. There will be alot of problems playing them as there's not enough memory and your graphics card won't run those games. Heres your specs for your PC http://uk.ts.fujitsu.com/rl/servicesupport/techsupport/professionalpc/esprimo/p/esprimop5600.htm i'd say you would need a new PC. Hope this helps