I've got two mouse devices, a PS/2 touchpad and a USB Logitech mouse which I\nuse interchangeablty. With Win 2000 and WinXP both devices installed\ncorrectly and I can use one or the other at will.\n\nWith Win98 or ME, it will not complete startup once the VIA USB drivers have\nbeen installed. Booting halts before the GUI comes up and the system often\nreboots by itself. To boot successfully I must disconnect the USB Mouse .\nThe USB appears to install correctly, no warnings in Device Manager. I have\nnot tried just the USB mouse without the PS/2 device.