some problem about the map of 1989

usually when i play the map of 1989, when i press f1 the bus usually like daceing, how can i slove this problem , it lets me annoying!!= =
i am using HP pavilion dv5 , is that any problem this computer??
Thx for answring

Perhaps your PC is to slow? Or the options are tuned too high?

Marcel Kuhnt schrieb:

Perhaps your PC is to slow? Or the options are tuned too high?

i think my computer is already 4 GB ram and my display card is GeForce 9600 GT 512MB (indepentent display card)