You wouldn't recover them from Excel but rather the operating system.
There are various utilizes you can use for recovering deleted files,
you should be able to find several using a Google search, but the
success rate depends on how long ago they were deleted, how much
you've used your computer since then, and whether you've ran any disk
utilities.
--
Please post all follow-up questions to the newsgroup. Requests for
assistance by email can not be acknowledged.
~~~~~~~~~~~~~~~
Beth Melton
Microsoft Office MVP
Word FAQ:
http://mvps.org/word
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http://mousetrax.com/techtrax/
MVP FAQ site:
http://mvps.org/