• plug the USB enclosure into the first USB 2.0 port. • put Symantec Ghost (that is Ghost32.exe) on a USB stick and plug it into the second USB 2.0 port.
• put a Windows Vista installation DVD in the optical drive and boot the laptop with it. You need Vista disc and not 7 disc, since Microsoft has stripped the Windows 7 installation DVD from its pre-boot environment, so you cannot run external programs.
• at the Vista install screen, select 'Repair your computer' • it will detect the HDD attached to the USB port with Windows 7 installation on it and offers to repair it (similar to the image below). Do not repair anything, but deselect the currently selected drive and click on 'Next'.