Please read the forum rules.
http://www.computerforum.com/52038-forum-rules.html
http://www.computerforum.com/873564-post1.html
Use Brian's advice to set the optical drive as the primary boot device. After that, you can try a repair using the steps below:
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XP REPAIR INSTALL
1. Boot the computer using the XP CD. You may need to change the
boot order in the system BIOS. Check your system documentation
for steps to access the BIOS and change the boot order.
2. When you see the "Welcome To Setup" screen, you will see the
options below This portion of the Setup program prepares Microsoft
Windows XP to run on your computer:
To setup Windows XP now, press ENTER.
3. Press Enter to start the Windows Setup.
4. Accept the License Agreement and Windows will search for existing
Windows installations.
5. Select the XP installation you want to repair from the list and
press R to start the repair.
6. Setup will copy the necessary files to the hard drive and reboot.
Do not press any key to boot from CD when the message appears.
Setup will continue as if it were doing a clean install, but your
applications and settings will remain intact
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^ Canned response.