Cause: The mouse is a major input device on any computer. However, if you have a disability that makes using the mouse difficult, you can check for alternative devices at your local computer store. Also, you can use the MouseKeys feature, which allows you to use the numeric keypad on your keyboard as input for the mouse movement. Finally, you may consider trying a trackball, which does the same thing as a mouse but is easier to use.
To use MouseKeys, follow these steps:
1. Click Start--> Control Panel--> Accessibility Options.
2. Click the Mouse tab--> select the Use MouseKeys check box. Click the Settings tab--> adjust how fast you want the pointer to move. The Top Speed slider bar determines the maximum speed at which the pointer moves when you hold down the key. The Acceleration slider bar determines how quickly the mouse accelerates when using the mouse key-->When you are done--> click OK.