File recovery software can be used.

Recover It All

Search And Recover

Norton Utilities  Undelete

You need to quit using the partition that the files were deleted from in
order to prevent the deleted files from being overwritten.  You will
need help trying to retrieve the files:

 RepoMan, $50, The demo version gives a fair indication of what
information can be recovered from your hard disk but data is not
recovered. http://www.diydatarecovery.nl/~tkuurstra/index.htm#irecover

 Recover4All, $49, demo will retrieve files up to 10 kb and show what
else can be retrieved.  Retrieved files are copied to another drive:
http://www.recover4all.com/

 Restoration, Freeware, not tried:  http://hccweb1.bai.ne.jp/~hcj58401/
or http://www.webattack.com/get/restoration.html

recovering the deleted files. One more step (pushing of
the delete button)is required to delete files completely
out of this bin.