Windows font?

Hi folks. Here's one from left field. I'm having
problems with a font that's used various places in
Windows. For instance, it's the font displayed when you
win a game of Freecell, that flashes YOU WIN!. This font
shows up from time to time, and I don't seem to have it,
so I just get those little rectangles. This problem has
come to a head because I purchased McAfee's Internet
Security 6 yesterday, and the install flash page uses that
very font for its install options. So I'm afraid to touch
anything just in case one of the options is "Intentionally
wipe your hard drive" or something equally ominous. Any
ideas?