Hi,
Firstly don't write or install anything on this drive as you will cause more issues & more likely start over writing areas on the hard drive that your data is on.
Secondly create an image of the hard drive & work on that. That way if it goes wrong you won't have ruined your chances.
R-studio is a great piece of software. Try their demo at
www.r-studio.comCreate an image then select it & try open files & see if it lists your files? If not then run a scan on the image file & see what files it shows it can recover.
Easeus partition table doctor can rebuild the fixboot, mbr & rebuild the partition table..
Good luck