I'm not sure how many people will take the time to find your post from a few
days ago. You may want to include any relevant details--or, even better, post a
followup in that original thread.
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Sometimes opening and saving in a different version of excel can help (sometimes
not).
If it is a corrupted workbook, you may want to try openoffice. Lots of people
have said that it's recovered workbooks that excel couldn't.
(
http://www.openoffice.org, a 60-65 meg download or a CD)
If the file is really important, there are commercial recovery services. I've
never used it, but you might want to check into:
http://www.officerecovery.com