What went wrong is that you did not make a backup !!!!
ALWAYS make a backup (spare copy) of important files. This can be as simple of saving the document in another folder with a different name. Put 001 on the end, then 002 then 003 etc.
For a long document you are writing save a copy every hour or so then you always have the latest copy.
Your documents may still be on the computer somewhere.
See if any of this helps you
http://support.microsoft.com/kb/827099