Missing Word Files

We have two users complaining that they saved word files to a folder and the folder is there but no files, the folder is completely gone and all files underneath. In one case the files were saved to a CDRW and some were even saved to a folder on the Novell Network. IN the first case, when the user searched for the files they would come up in the searh and it pointed to the place that she had saved to and when she double clicked the file would come up. She then would do a save as to recover the file. In the second case, she was not able to find the files in a seach. Any one else experience these problem