Vista - Weird Menu Errors

I know this is not a problem with the software this occurs in, since they
have been working until recently.

Some examples:
http://img504.imageshack.us/img504/5723/testpp0.jpg

In the top one, many menu icons are missing. Only two remain. No idea why
those two would remain and everything else disappearing.
In the bottom one (firefox), the tiny square on the left is what appears
when hovered over,
and the slightly bigger rectangle on the bottom is the tooltip. Both are
completely blank. =(

This also happens in some other programs, in only *some* of the "menus".
Selectively. Tiny blank boxes where menus/tooltips should be.

I had a feeling these were all related problems since they happened at
roughly the same time.
Unfortunately I don't recall what I was doing beforehand. Maybe related to
graphics drivers? I have no idea.

All of Vista's menus are working fine, I think. Just software.

Thanks in advance. =(