Copied all my brother-in-laws files for backup to a 120GB NTFS drive, reinstalled windows on his main drive, went to get the data back and it cant even read the damn thing

Windows says it isnt formatted, but it was, and it worked fine!!! we even checked the data to make sure it copied everything before we redid the main drive. I would use fdisk/mbr but I dont think that is for ntsc, and it doesnt come with windows of course. I REALLY need some expert advise on this one, and fast

We lost EVERYTHING of his. Well unless I can get it back off this drive.
I have tried a usb enclosure, 3 different computers, main drive, slave drive, etc. with no improvement. I am trying to run a recovery program now - cant remember the name, but it was a free one I found online.
It is a Western Digital 1200JB if that matters - 8mb cache 7200rpm.
PLEASE HELP
Mike