Slow lagging reaction

[kaffi-x]

Hey I've been playing this game for a very long time, and I had to redownload the game onto my PC which had to get fixed ( at the same time getting windows7)... Now no matter what version Assaultcub I download it seems to be very slow and laggy, no matter what I do, it will not change. I uninstall it and tried re-installing it many times to make sure, and damn... Its still not working, please help me and figure this one out =]