When Excel starts, it opens an *.xlb
file, which contains menu and toolbar customizations. If this file is
damaged, it might cause Excel to crash when it’s started. Also, this
file might (for some reason) be very large. In such a case, this could
also cause Excel to crash. Typically, your *.xlb file should be 100K or smaller.
If Excel crashes when it is started, try deleting your *.xlb file. To do so, close Excel and search your hard drive for *.xlb.
(The filename and location will vary.) Create a backup copy of this
file, delete the original file, and then try restarting Excel.
Hopefully, Excel will now start up normally and create a new *.xlb file.
Deleting your *.xlb file will also delete any toolbar or menu customizations that appear in the Add-Ins tab.
