But I could be wrong. Your description of the Cruzer was helpful.  Unfortunately I suspect the running of CHKDSK screwed up any chance of file recovery, by any recovery app, and for shekshek’s sake I hope I’m wrong.
FWIW Free file Recovery apps:
http://download.cnet.com/Restoration/3000-2094_4-10322950.html
http://www.scanwith.com/download/Undelete_Plus.htm
http://www.cgsecurity.org/wiki/PhotoRec_Step_By_Step
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Do make sure you click the correct Download button . Some ads on download pages try to confuse people.