Computer freezes hwen trying to play these games...

HiMy computer suddenly freezes when i try to play some games Company of Heroes and Starship Troopers.
It happens in CoH im trying to play, i can start the game go to the menu and all that but when the map is loaded and i am in game it freezes and the sound gets noisy and wierd, when i try to play starship troopers i get past the intro vids. but where it says Start Game the same thing happens.
I asked the same question in a Norwegian forum and thay told me it could be RAM issues or a weak PSU, i ran a RAM check and bought a new better PSU, the RAM is ok (i tried other RAM chips also) but the same thing happens.
I don%26#39;t think it has anything to do with that my computer cannot run the games becous it runs rainbow six vegas and C%26C3.Any suggestions and help would be verry apprichiated!
(sorry for my bad spelling)Here is a link to a DxDiag.txt file if thats to any help
http://tinmanweb.googlepages.com/DxDiag.txtComputer freezes hwen trying to play these games...
One topic is enough. :)