kb.exe does not work

[Jiggen]

Hi

i just purchased KB: AP per Steam.

It starts perfectly but when i click on next-button after choosing the class, there first ist the loading seqence then, some video seems to start but is interrupted immediatly by Windows 7 which tells me "kb.exe does not work anymore" the game gets closed and windows cheers me up that they will notice me when they found a solution.

as i dont think that microsoft really will, i thought some of you maybe know what to do? As the game starts normally i dont think its something about steam...