A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Bill,
Thanks for the fast response. I started excel in safe mode like you suggested and it saved without any errors. I had installed AspenPlus V7.2 (a chemical engineering simulator) on my computer yesterday morning and it installed 2 excel add-ins. I removed both of these add-ins and everything is now running fine. I am not sure why it was running yesterday and not today, but at least it's working now! Thanks again!