Why cant I play any games on windows 7 build 7000? -

I can play games normally on windows XP, but when I use Windows 7, it always gives me an error message and shuts down the game instantly.

Probably just a compatibility issue. Windows 7 has only just been released in the beta version, so it s hardly a full package right now. When the final version comes out, it ll hopefully have a backwards compatibility mode for XP/Vista games.