When I got on Firefox today, my system tray and the top of the screen were tan.

Normally, they are blue.  The fonts also changed.

Whenever it changes to the tan, certain things don't work, like my speakers.

How do I get back to the blue and keep it that way?

I did restart my the PC because McAfee needed it.  Is this the problem?

Running XP.

Thanks.

Update:  I shut down the PC to clean it.  Now it's back to normal, kinda.  The background I'm typing on now is tan/yellow, not white.