I'm running Windows Vista on a Dell EPS 410 desktop. I never had this happen before but when I go into a cell and highlight text then go to the Font optiions on the Home screen and to the drop down Arrow next to the capital A to change font color of text, Excel shut down when I clicked on Automatic to get the font back to black. This happened several times, so I erased the red text and rewrote it into the cell and the same thing happened again. I then rebooted and the same thing happened.
Now as I write this, Excel is working normally again. I'm not sure how long it will work and I'm writing to see if someone knows what could have caused this error and what could have automatically corrected it.