Ok I have a windows 2000 machine with a fresh install. Mouse works fine untill I shut it down to take back to the customer. When I get it back to the customer there is no curser and when I tried to right click no menu. So I checked out the device manager and there is a yellow ! mark by the mouse. So I deleated it and rebooted. Mouse works fine. You can reboot all you like and the mouse will work. But if you shut it down for a period of time when you trun it back on no mouse and the driver has yelleow !. I have reloaded the machine twice and same problem. I have all windows updates on machine. I have checked dios settings and all is normal. I have checked all other software and hardware and nothing else is causing a problem. The mouse is a standard PS/2 Scroll mouse. I have tired 3 diffrent mice 2 of them brand new. Is there a simple driver update or what. I also checked another Windows 2000 Machine and in the device manger the mouse is listed under mice and other pointing devices. And if i remember right on the machine i'm have problems with it is listed under human interface device. Please help this is driving me nuts.