Thankyou for the quick reply. Unfortunately, remounting the drive back again didn't bring the window back up.
Now for the link that you have provided, are the instructions same for Windows 7 users? There were instructions for XP and Vista users.
I have a unit with a dead motherboard but with other stuff working like the hard drive and power supply. So I decided to change the motherboard only. Then I removed the hard drive and placed in on an enclosure to back up my previous files so I can perform a clean install of windows...