Does rebooting help?
If yes, then maybe it was a stuck key.
If no, can you try this:
close excel
windows start button|Run
excel /safe
Did that help?
Starting in Safe mode keeps lots of things from starting--including "helpful"
macros.
If that worked, then it's time for some detective work.
Chip Pearson has some instructions for finding problems at:
http://www.cpearson.com/excel/StartupErrors.htm
Essentially, you're going to move stuff out of your XLStart folder and uncheck
everything under Tools|Addins. (But keep track!)
Then one by one, you'll add one back and restart excel to see if that caused the
problem.
