1. Locate you Windows XP CD and place it in your CD-ROM drive.
2. Restart your computer, or turn it off and then back on. How to fix NTDLR MISSING error.
3.
When you computer restarts you should eventually see the words "Press
Any Key to enter Setup". If you do not see these words and it goes to
the screen that gives you the error message, you will have to change
your boot priority in your bios settings.
Changing boot device priority: A.
When you see you’re the first screen, the boot screen, press delete a
few times until your computer beeps. Pressing the delete key will bring
your computer up into the bios settings. The key you need to press may
differ from computer to computer. If the delete key doesn't work for
you, contact your computer manufacturer and ask them what key you need
to press to get into bios.
B. After you are in your bios
settings you will need to navigate to your boot settings. Depending on
which type and version of BIOS you have, this process may be different.
Either way, there should be a section called Boot or Boot Priority.
Navigate to that and make sure that your CD-ROM has top or first
priority. After you have don't that, save and exit (press F10).
4. Once you see the "Press Any Key to Enter Setup" message, go ahead and press any key.
5. This will start the Windows Setup Process; it will take it several minutes to load.