I have a couple of spreadsheets that I want to set password.
I did:
Prepare - Encrypt Document - type a password - Confirm a password

When I try to close the file, it says:
"Microsoft Office Excel canno access the file ..... There are several
possible reasons.
*The file name or path does not exist.
*The file is being used by another program.
*The workbook you are trying to save has the same as a currently open
workbook."

Is there a way to fix this?
Thank you in advance.