>Sounds like a hardware configuration/driver issue. Having identical machines, you can troubleshoot more easily.
>
>(0.) Are the machines truly identical in hardware?
Yes, I bought the parts about 6 months ago and build all the machines

>1. Start at the BIOS at boot time - go through all the screens and make sure the settings are the same as those on a working machine.
I have checked the BIOS, but not during the boot process, I will give that a try.

>2. In Windows, go into Device Manager and check that all hardware, but especially video driver and mouse hardware is detected correctly and has functional drivers installed.
Didn't even think about video drivers.

>3. Press Ctrl-Alt-Del and look in the list of running processes - see if anything is different between the two machines.
Besides Applicatioins, the processes are the same.

The thing that is weird though, is it is only fox that kills the mouse. If I exit Fox, the mouse comes back and works fine.

thank you for the suggestions and help.

:-)