I would not do anything with that drive before you make a full backup of your files.
It's probably a physical error on the drive that will never be fixed by software. After you copy all your files out of the drive, you can try to clone it using a program like Clonezilla to a second good drive and see if that works. You can't just clone the readable parts, a clone of a drive is all or nothing.
Just copy your files, and do a clean setup on a new drive and re-install your program.