Did you change the location of your saved folder from the default (C:\Documents and Settings\your name\Shared)?
Use your computer's search to look for some of the file names. Things shouldn't disppear unless you've deleted them. If you accidentally delete from the LW library, files don't go to the recycle bin.
The latest LW Beta 4.13.0 sends files to the recycle bin but earlier versions don't.

If things really are gone, check the sticky below for file recovery advice
Deleting files from LW library - Don't!! File recovery advice

Good luck