windows 7 sudendly crash.

hello.i m running windows 7 enterprise edition 32 bit english . i want to try out and then buy the windows 7.but always it stuck!while i m doing something(doesnt matter what because everything i m doing after 3 min it stucks.) my pc specs:ati radeon hd 4770,asrock P45TS,intel core 2 duo e8200 cpu 2,66 ghz 2,67 ghz.STUCK=i cant move the mouse or do something,sometimes it also do an awful sound like a game boy crashing....the solution is to restart but then i get the same error.i downloaded enterprise from official site and i m not running it more that 2 days.i tried to format many times .after the format i download the latest drivers and i m done.but always i get this error! please help me fix it. :(

also i forgot to say that i have 2gb ram.

so any help?

any help or i just waste my time here?

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