iMac 2.4 GHz Bootcamp - Wrong drivers?

Hello

Im using bootcamp on my iMac. Its actually weird. If I try to play some games, I always get pretty bad FPS.
For example, in most CS (Counter-Strike) maps, I get like 40-20 FPS where it should be 100. Its impossible to play like this.

Is there something I've done wrong, which drivers should I have or does anyone else have this kind of problem?

Thanks in advance
fawk3s

Install the latest drivers: http://ati.amd.com/support/drivers/mac/bootcamp-xp.html

Heh, those drivers worked . Had tried to instal them before too but didnt complete the installation. Now it did and everything seems to be ok. Thanks

EDIT: Actually, its now better, yes, but if the game's "Nightvision" is turned on, its still bad. Is there something more I can do? Cuz its pretty bad like this. :/