Fran, You said that you like the Large Windows Font option.
While that should be ok in most situations (that is our normal mode), some routines may not like it. The UFT 3.0 Global Find and Replace window needs the Small Font, so whenever we want to use that feature, we have to set our Windows environment to Small Font, reboot our machine, do our searching, and then reset to large font, reboot, and continue. It is an annoying extra few steps, but we also prefer the large font for our display environment.
I strongly recommend re-installing the two primary MS fonts, or you may encounter other windows display problems in the future.