On Friday, February 9, 2007 at 10:21:02 AM UTC-5, Sally84 wrote:
I am unable to right-click in my spreadsheets (to access the copy, paste,
format options), and it is driving me crazy! Help!

The easiest way to fix this issue is by renaming Excel's XLB File Extension.

Example - (old) Excel15.xlb (new) Excel15.OLD

This will force excel to re-create the XLB File and your right click menu will return guaranteed

This file is located usually in the following location:
C:\Users\Your User Account\AppData\Roaming\Microsoft\Excel