1. Take the side-panel from your case and connect the SATA wire to the second drive and motherboard SATA port.
2. Mount the second drive to the 3.5" bay and close the case up.
3. Switch on the computer and make sure that the first HDD is the boot drive (with Windows 7 installed & all the drivers) via the BIOS (setup).
4. Go to "My Computer" and 'quick format' the new hard-disk drive.