Windows XP
1. Insert the Windows installation CD into your computer's CD-ROM drive.
2. Reboot your computer. When 'Press any key to boot from CD' appears, press any key to start Windows from the CD.

3. Hit 'Enter' on your keyboard when the 'To setup Windows XP now' message appears. Press 'Enter' again when the 'Welcome to Setup' screen appears.
4. Select the drive containing Windows and hit 'R' to launch the repair.
Windows Vista
5. Insert the Vista installation DVD and look for the 'Press any key to boot from CD or DVD' message. Press any key to boot.
6. Choose the 'Language to install,' 'Time and currency format' and 'Keyboard or input method' options desired.
7. Click the 'Repair your computer' option. When prompted, select the Windows Vista installation on which you are performing a Startup Repair. Click 'Next.'
8. Click 'Finish' when the 'Restart your computer to complete the repairs' window appears. This will reboot your computer. Select the 'Upgrade' option, then follow the on-screen instructions. Once Vista has reached its final welcome screen, remove the CD.
Windows 7
9. Insert the Windows 7 installation DVD into the computer and press a key to boot the computer when the 'Press any key to boot from CD or DVD' message appears.
10. Choose the 'Language to install,' 'Time and currency format' and 'Keyboard or input method' options desired.
11. Click the 'Repair your computer' option.
12. Select the Windows 7 installation on which you wish to perform the Startup Repair. Click the 'Startup Repair' link.
13. Click 'Finish' when the 'Restart your computer to complete the repairs' window appears. This will reboot your computer.