1. Restart the Apple computer. Hold down the “Option” key as the system boots up. The boot drive selector will appear.
2. Insert the Windows XP installation disc. Select the disc from the list of bootable options. Press “Enter” to launch the disc.

3. Press any key to boot into the Windows XP CD, as prompted on-screen. Navigate past the Welcome to Windows Setup screen (press “Enter”) and accept the license agreement (press “F8”).
4. Select the Boot Camp partition containing the Windows XP installation (C: drive). Press “R” to begin a repair installation.
5. Follow the on-screen instructions to complete the repair of Windows XP on your Boot Camp partition.