A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Please follow these steps:
Close Excel
Press and hold the CTRL key
Open Excel
Wait for a message to appear and ask for "Safe Mode"
Release the CTRL key
Click Yes
After Excel opens
Click File\Open and select your file
Press and hold the SHIFT key
Click Open
Wait for your file to open
Release the SHIFT key
Test the behavior
What happens?
If CTRL+1 does not work, does the Format window comes up if you right-click and choose "Format Cells"?
Andreas.