Goto system restore - (Start/ Accessories/ System Tools/ System Restore ) and restore to an earlier date (yesterday,last week..etc) u will lose the very most recent thing more than likely the further u go back.. but if u have a save point almost right before it "crashed"/"reset"/whatever then u wont lose much.
if u dont want to lose the document u currently still have u can save that to a usb drive and then do this stuff.. that way if u recover all the lost files, u can then add the new one back on through your usb drive.
Also if you think the files have just moved, you can simple try the search inside of explorer for windows....search for a file or something you remember in that folder...even if you search generically for ( *.doc ) it will pull up all document files in the area you are searching (choose whole computer or C drive if you only have one drive for data)
-murph