Hacking/stuttering mouse! heeeelp!

OK, so i finally got windows 7 installed, and now when i start Crossfire i can't look around fluently, and the cursor in lobbies and storage is very stutter... y. I don't know what to do, everything else works, i've tried portal, modern warfare 1 and 2 and GTA vice city. CF is the only game this happens! For reference The OS is ultimate 64 bit SP. 1.