Windows 7 - getting annoyed with windows 7

Ok first of all im a bigger gamer i play counter strike for money. To make money i need a computer and windows 7 is not letting me have my normal computer lol. so here is the problem every time i play a game like counter strike, bad company 2, it does not matter the graphics in it "****" up in like 10 mins its completely random. strange shapes start appearing from nowhere and stuff like that. but some times my games completely crash and it says your drivers have stopped working and has recovered. i did not have this problem before when i was running xp im thinking about switching back. i think it might be windows having problems with direct x or something like that im clueless of what to do .

Here are my comp specs:

Processor: Intel(R) Core(TM) i7 CPU 920 @ 2.67 GHz 2.67 GHZ
Installed memory (RAM): 3.00 GB
System Type: 32-bit operating system
Graphics card: ATI Radeon HD 4870 x2