EMERGENCY - I saved a Word document several times as I worked on it, and now it is totally missing. Vista is?

telling me that I haven't even worked on any documents today. I saved it in the same file as the prvious version I was editing - I swear. Where the heck did it go? I even went to Start/Recent Items and it is not listed. It was a five page document. HELP!
Update: Note that I have Word set to Autosave every 10 minutes, too, and I worked on this damned thing for at least an hour.
Update 2: I already did what #2 and #3 suggested - not there. I am reasonable good with Word and Windows - have been a user for at least a decade - but certainly do not know all the stuff about what happens in the background.
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