Generally if this happens you can quickly fix it by running through some basic troubleshooting steps.
If something is wrong with the mouse pointer and you get jumpy or erratic behavior, then this can really impede on your ability to use your system. Even though Apple and other computer manufacturers are incorporating more multitouch options for interacting with computers, the mouse and pointer is still one of the primary options for managing the system. The operation of the mouse and pointing system in graphic operating systems is one of the more important aspects to having a smooth experience when using your computer.
