How to Repair Windows XP With the Startup Disc
- 1). Restart your computer with the Windows XP installation disc inserted.
- 2). Press any key when the "Press any key to boot from CD" message appears. Ignore the to use the Recovery Console.
- 3). Press "F8" after you have read the "Windows XP Licensing Agreement."
- 4). Use the arrow keys to select your current installation of Windows XP, then press "R" to repair it.
- 5). Follow the on-screen instructions to finish repairing XP.
Source...