Hey bro I know this sucks but here’s what you have to do.
1.Remove the drive from the enclosure, be careful as you could break the enclosure as it is not always designed to be opened.
2.Plug the drive to your PC via SATA or IDE (depends on the hard disk, I’m almost sure it will be sata, though) And it should read your files correctly at that point, if it doesn’t, go to step 3.
3.Get ahold of a registered copy of GetDataBack (fat32+ntfs) and backup your files manually from the drive, then you can put it back in the usb case.
note: if you open the drive and find out it’s a zif slot, you’re out of luck unless you find a compatible adapter.
Also sometimes it works via USB but I don’t recommend it as many of my files were corrupted when I tried it with 2 different external drives.