@TheKyle55 okay there could be various reasons for this issue. Could you please tell us some details about your videocard as well as what kind of mouse and keyboard you are using?
A few things for your checklist:
1. Try to change the resolution of the game aka to run the game in window mode
2. Update the driver for your mouse
3. If you have an ATI card, go to your Catalyst Driver control panel and disable "Catalyst AI" <- can corrupt mouse cursor
4. If you have any other device plugged in to your PC (controller, graphic tablet, joystick etc.), unplug it.
Please keep us updated.
Basti
