PS2 Mouse is not detecting?

Have a Dell that is connected to a KVM Switch that uses ps2 mouse. The mouse works fine on the other two computers that are connected to the KVM Switch, but not the Dell. If I remove the pad and mouse driver from the Dell it will work the first time until it finds a driver and reboots the machine and quits again. I'm sure there must be a driver conflict or IRQ, but do not know how to change it or get rid of the driver detection automatically? Scanned for new driver but none found. Any Suggestions or how to change the IRQ? Thank You!