Question corrupted Hardrive?

[Hey2209-]

so i was playing minecraft(pc game)when all of the sudden my froze completly i had to make an cold reboot(i think its called so)after the booting
my pc reproted an I/O error.
(with an code wich i dont remember)
i got this error before and fixed it using testdisk (systemrescueCD on an bootable USB).
( the second MBR was corrupted the program wrote the main MBR Code to the second )
i did the same thing but the MBR was alright and the hardisk structure was ok.
the disk is unmountable on the systemrescueCD operating system ERROR:mount point not found.
i dont have a windows install disk
is there a way to extract the license key so i can download an window image?
System specs:
CPU:Amd athlon x2
Motherboard:GIGABYTE GS-M56S-S3 Dual chanel DDR2
Hard drive :SAMSUNG HD502HJ 500,00GB
Graphics card:XFX with passive cooling

 

[hang-the-9]

Before doing anything with Windows, you first should replace the drive.

To get the Windows key, look here https://www.howtogeek.com/64600/how-to-recover-windows-and-software-keys-from-a-broken-computer/