[url=***********.softwarepatch.com/tips/howto-file-recovery.html][b]HERE[/b] are some free programs. If you use a search engine you will find heaps more.
Just remember, the more you use your PC, and if you install other programs, the more you will negate any chance of recovery.
The best programs to use are ones you can run from a floppy or CD. Make sure you use another PC to download the programs to increase your chance of success.