Varies a bit among brand and model.
Home or Professional?
OEM, Dell, HP, Compaq, or Sony.
Usually, you cold boot to the CD, then get choices. You bypass some selections and look for R Repair. Do not select the earlier choice of R for Repair Console
Backup your data first, if you can. Make certain you follow the warning links before initiating the Repair Install. You can print a text version for reference... repair.txt
a: Boot your computer using your XP CD. You may need to change the boot order in the system BIOS so the CD boots before the hard drive. Check your system documentation for steps to access the BIOS and change the boot order, or do a gurgle search.
b. Upon seeing the "Welcome To Setup" screen, you will see these options:
This portion of the Setup program prepares Microsoft
Windows XP to run on your computer:
To setup Windows XP now, press ENTER.
To repair a Windows XP installation using Recovery Console, press R. (YOU DO NOT WANT TO SELECT THIS CHOICE IN MOST CASES)
To quit Setup without installing Windows XP, press F3.
c. Press Enter to start the Windows Setup.
To setup Windows XP now and Repair Install , press ENTER. ( DO NOT choose "To repair a Windows XP installation using the Recovery Console, press R", (you Do Not want to load Recovery Console). You do not want to choose "To repair a Windows XP installation using the Recovery Console, press R".
Keep going and you will later get another choice
d. Accept the License Agreement and Windows will search for existing Windows installations.
e. Select the XP installation you want to repair from the list and press R to start the repair. If Repair is not one of the options, END setup. After the reboot read Warning#2!
f. 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.
g. When not sure, don't select any, and do another cold boot to the CD until you are comfortable with the choices you are given, as restarting to a cold boot will not hurt anything.
This will get you started with most recovery CD's from Dell, HP, Sony, Compaq, eMachines, and so on... and for Home and Professional OEM versions. Some early versions of WXP without a Service Pack or with Service Pack 1 will be a bit different, but still will give you the R for Repair after you bypass the R for Repair Console.
Good luck,