WinME - Mouse Error

My computer does not update, or execute unless I keep moving the mouse around. For example the screen saver proporties window, the little preview window. I can click "3D Box" for the screen saver. Now it will not sohw until I move the mouse around, and if I stop the mouse the screen saver preview stops also. That is an example, but it does it on everything on the machine! How do I fix it, or whats wrong with it?
AMD 400MHZ 3d processor, 64 RAM, home build pc. Please help if you can! Thanks in advance. please email responce to: [email protected] Thanks!