>I will try as you suggest, but everything was working fine a couple of days ago. Do drivers go sour after a while?
>

A GPF is a General Protection Fault which means that an application/program (Foxpro) attempted to invade a protected memory area in use by a different program (your video driver). Win3.1, to protect the driver, kills the invader.
I don't know much about the S3VSND.DRV, however with some video drivers you can specify inclusion/exclusion memory areas.
The fact that everything was working fine 2 days ago is puzzling, I agree.
Is it possible that you changed the resolution/colors recently ? Any changes made in appearance/display setup could make the driver attempt to use different amounts/areas of memory.
I had experienced this kind of problems very often with FPW2.6 and Windows 3.1x. Everything appears to work much better in Windows95 which I currently use with no major problems.
HTH
Sorin