1. Insert the Windows Installation CD into your computer and restart it.
2. Press 'Enter' when a message appears that asks if you want to have the computer boot from the CD.

3. Press 'Enter' again at the Setup window for the 'Setup Windows now' option. Do not start a repair console.
4. Accept the Windows Licensing Agreement.
5. Select the 'Broken Installation of Windows' at the next screen and press 'R' to repair that installation.
6. Wait while Windows automatically reinstalls all windows system files. This process should not delete any personal or program data on your computer.