There are a lot of file recovery programs but I recommend a disk explorer program just to see if the files are still physically on the drive and haven't been written over yet. Usually the disk explorer programs have a file restore built in as well. I use iobit advanced system care because it has everything I need built in but if you don't want all that crap just google a separate disk recovery/explorer program. Usually the freeware is just fine, I wouldn't recommend paying for them unless its commercial use and you need support.
TOP TIP: Do not install the application to the drive from which you are trying to recover files. Installing on said drive may overwrite the space where the files were - losing them forever.