Unless you e-mailed someone the presentation (look in your sent items) or
are using 2007 and haven't closed it (in which case you may be able to
'undo' your way out of trouble) or are using certain versions of Vista
(right click the file and select 'restore previous version' or something
similar - sorry don't have the vista box turned on at the mo to check) then
I'm afraid you are out of luck. Do you have a backup?
