This link is for a free software that will recover files from a formatted drive. You have to understand what a format of a drive is and a format does not erase files , what it does is it lets Windows write over the sectors that have data on them. In normal conditions Windows cannot do that but a format allows it to do just that. So in effect with a format the data is still there and this software will recover it for you. I have used this myself when I accidently formatted the wrong drive and now all of the files that I had on the drive are back.
So if you have to format the drive to be able to accdess it at least you will know you can recover those files.