blank or black screen...

i have been playing crossfire for about 1 and a half months now. when i play ANY map my screen just goes completly blank randomly... i reinstalled it and redownloaded it 3-5times now, yes i have been turning of my realtime protection and i downloaded it and added it 2 my acceptions list. once the screen goes blank i can still hear the sound and i can stil type once i type everyone and read it i can shoot like usual and do anything but the screen is all blank.... plz help!!!!!!!!!!!!!!!!!!!!!!!!!!! i have windows xp professional version 2002 service pack 3. my friend has the same one as me and plays with no difficuties plz help me!!!!!!!!!!!!!i get realy angry when i get ace and then it blanks out. so please help me.

p.s when i do other stuff on my computer this never happends. also it doesent always happen when i play about 80% of the time. >.<

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