My cursor/crosshairs are oddly off-center. How do I know? Well, the default Windows cursor shows up on my game screen. The game cursor/crosshair is above and to the right of the Windows cursor. Any ideas for what might be causing this?

I've got Windows XP, a GeForce 2, and a Logitech Optical mouse. I've uninstalled/reinstalled the game and all my drivers are current.