[EXreaction]

Quote:

Repair installation: Running a repair install of Windows XP can be a handy way of fixing the installation of XP without having to start totally over and deleting important data from your PC. To do this type of install, simply follow these instructions.

1. Boot from your XP installation CD.
2. At the welcome screen, choose enter.
3. Once at the license agreement, press F8.
4. At the next screen, choose to repair the selected Windows XP installation by pressing R.
5. The files will begin to install and then your PC will reboot. During the reboot you will be presented with option of booting from the CD again by pressing any key. Don't press anything. Allow it to finish the install without booting from the CD again.

I found this on some site, it is much better than having me try to tell you how(i'd probably miss a few importiant details)!