All i can tell you is that maybe its time to just un-install HL and CS altoghether, re-install HL, download the latest patch for HL, and then download CS 1.0 Full. Thats all i can really tell you to do. Tell me if that works if you try it, becuase it might just be a conflict in the drivers with your mouse, a re-install should do it. Lemme know if it works, hope it helps!