[the red reveren]

I recently bought the game & installed it. The problem is, that everytime i play the game & it runs for about 5 seconds then it not only crashes out the game, but my pc also crashes into a restart.
My sys specs are as follows,

ram = 512mgb
graphics = radeon ati 9550
h drive = 300gb
cpu = amd 2400
op sys = windows xp
direct x = 9b

I more than qualify for playing the game, but why am i having problems with it like i am?
I have tried reinstalling the game aswell ,but it still does the same. i do not get an error log to see what is causing the game to crash out & crash out my pc.
I have tried some patches from another website, but all they do is take away the single player icon & nothing else. The game is something i really want to play, but i am frustrated in not getting the chance to play it.
PLEASE can someone help me with this problem.