File recovery is a expensive job especially after you have formatted and reinstalled a operating system ( I surmising you installed a OS). You probably have overwritten the files you wanted to retrieve.
There are various tools on the net you could try with varying success, but I do not think you will much luck.
Always make backups of important stuff so you do not lose anything of value.
Here's one called Recuva that may help salvage something. Recuva - Undelete, Unerase, File Recovery - Home