>>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.

FoxPro and VFP, through all its versions, has had a long and celebrated history of stressing your computer. If you have any problems with hardware or configuration, you'll likely notice it in FP/VFP first.