Crossfire black screen stuck using vista

Hi,
Crossfire use to work on my pc but now it does not I uninstalled and reinstalled about 6 times now. Crossfire opens then When I click on start game gameguard opens and everything then the black screen pops up and stays there forever. I have to hold the power button to restart the computer. So I tough my computer was the problem so I installed combat arms and it worked like a charm. I do not know why this is happening. I really want to play crossfire. Please someone help me. I have and had kaspersky (KIS 2010) I disable it always when I play all games
Thanks,

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