It sounds like the workbook is corrupted.

Sometimes, you can save it by opening it in a later version of excel and saving
it with that version.

Lots of people have said that they could save a great deal of the data/code (not
sure about comments) using OpenOffice.org.

http://www.openoffice.org, a 60-65 meg download or a CD

There are commercial recovery services. I've never used it, but you might want
to check into:
http://www.officerecovery.com

Vormov wrote:

I am opening an excel program from another computer on a network. When I
open it it says "file error: data may be lost" and all my comment boxes are
gone. Any suggestions?

--

Dave Peterson