Recuva

Recover deleted files with Recuva, a new utility from the developers who brought you the venerable system-scouring tool CCleaner.

Though currently in beta, the spit-polished program couldn't be much easier to use. Choose a drive to scan, wait a few seconds while Recuva looks for recoverable files (those that haven't been overwritten on your hard drive), then review the results. Select the files you want and click Recover. Presto: The lost files return.

Take a look HERE.

Other free options available are

PhotoRec
Restoration
Undelete Plus
GetDataBack
PC Inspector File Recovery