PR not starting

[Hietaa]

I have a slight problem with my new computer. Just installed PR and now it won't start for some odd reason. When staring PR i only get the PR splash screen and nothing after that. I've tried running it as an administrator and in xp compability mode and none of them helped.

I don't know the what parts are in this computer because i haven't bought it myself but i know that it has:
ati radeon hd6870
some 6 core amd processor
4 gb of ddr3 memory
and is running win 7 32 bit