The mouse cursor under X is useless because it jumps to random spots at randome times when the cursor is moved. When I move the mouse the cursor may move about 200-300 pixels before it jumps to a different spot on the screen.
Buttons also click without pressing the buttons.
I have a serial mouse and a bus mouse with the propor drivers both with the same effect. My motherboard is a ASUS KT133. You may be able to set it there. Also, check with DrakConf that you have set up the correct mouse. Real men upload their data to an FTP site and have everyone else mirror it.