You could check for a system resore point.. you might have one from a day or so before it happened if your lucky.. though I doubt that'd work..
Did you just start it upand everything is gone? Or were you messing around and accidently deleted everything?
i signed on and everything was gone... but i just did a restart...and what do u know its back..im so happy =]
go to ur email and if ur one of those annoying people who always send group emails u should find them all listed in ur sent box...aslong as u save sent mail