black screen help???

when i play darkes of days i have no problem.
when im loading the game there is where the problems begin
somthimes i can play 5 lvls without any problem but when i load another lvl me screen turns white-black i cant do anything i need to restart me pc. when i play back darkest of days i CAN play the lvl, when i load another map it restart all over again
i can play evry new game but whats the problem can anyone help me???

srry about me english its bad