Maybe you protected the workbook.

Tools|Protection|Unprotect workbook
(You may need to supply your password)

Mike wrote:

I recently hid several tabs in my excel file (excel 2002), the next time I
opened this file, I tried to unhide one of the tabs, but could not. The
unhide command was not availabe, and I have made sure all the appropriate
check marks are there for show sheet tabs, etc. I have seen several
suggestions about subroutines, but I dont understand how you use one. Can
someone shed some light on my problem?

--

Dave Peterson