It doesn't matter what I play, when ever I open the game I always get an error messages straight away that says the game has stopped working. If it's a program, it works fine. It's only affecting games. I'm running some older games (1990-2000) plus games up to Portal2 and none of them work. I've ran memory tests and re-installed the OS, neither of which worked. The specs are 4gb of ram, Nvidia geforce gt 520m, win7 64 bit and intel i5-2450m.