<< suggest you disable it in device manager then but you'll have to have the usb mouse installed first! >>
Touchpads don't show up in the Device Manager. They are just another PS2 device. Because only one device is seen when both are connected, only one's features are accessible.
It sounds like his problem really is a driver problem though, so he should try removing the touchpad driver... That fixed my issues, but I CAN'T disbable it now 🙁