First, don't mess with any fonts or sizes in the Contol Panel Display. Second, make sure that MS Sans Serif is really gone, and not just hidden in a backup folder. It should be listed alphabetically in the *M*s.
MS Sans Serif may not be gone because it is the foundation font of the Windows Desktop. I never tried to delete it, but I once found I could not move MS Sans Serif in Win95 until I renamed it.
If the font is really the problem, the reason your boxes are too large is that, with all due respect to Foxpro, it cannot resize other fonts to fit the windows the way that Win 95/98 can on Desktop.
So, either borrow a copy of MS Sans Serif from a friend or get out your Windows CD and grit your teeth and pray. Either way there is no hurry. Both UFT and Windows will probably continue working. -john-