I had to buy a new hard because the old one went wrong. I was running Windows 7 64 bit on the old one, i do not have a windows 7 installation cd and the sticker underneath with the product key is faded. Do i need to buy a new window7?
Recovering from your recovery discs
To reinstall Windows and all pre-installed software and drivers:
1 Turn on your computer, insert the first system recovery disc into your
optical disc drive, then restart your computer.