A file recovery program would have a good chance of getting back your files if used soon, before they get overwritten. This one is supposed to be pretty good, and it's free:
PC INSPECTOR File Recovery http://www.pcinspector.de/file_recovery/UK/welcome.htm
PC INSPECTOR insists that you save recovered files to a different drive. You could save to another partition, if you have one, or to a CD or floppy, or a USB Flash drive, I believe.
Did you read the program's help files? Click the question mark on the program's welcome page to access them.