Dissappearing Mouse

Running XP w/all updates. Have a Kensington Expert Mouse Pro (USB). When I do a cold boot, no mouse is installed. If I unplug mouse, new usb device is found, but won’t work. If I reinstall Kensington’s mouseworks software and reboot, new harware is found and mouse works. Doesn’t matter which usb port. Other devices work fine on all usb ports.