Looks like you're not alone.
See if any of these Google hits have a solution: Crashed Module Name: Microsoft Excel
A lot of the suggestions say to Validate Fonts
Use Font Book (it’s in Applications > Utilities folder) or other font utility to validate ALL your fonts. Delete old versions of duplicate fonts. Delete fonts that don't validate completely. Restart your Mac and empty the trash to get rid of the unneeded fonts and free up disc space.