|The keyboard MUST be working properly for either method.|
If you find it doesn't, DO NOT quit whatever you were doing if you had already started either procedure, try plugging in a USB connected keyboard and using that instead.
The Boot Order or similar settings must be set in the mboard's bios Setup such that CD-Rom or similar is listed before hard drive or similar
See Response 1:
OR - on most laptops, you are prompted with a line early in the boot sequence "Press xxx to select Boot device" or similar - you press the key while that line is on the screen and select CD-rom, or similar.
When the bootable Windows CD is detected while booting, you will see a line "Press any key to boot from CD" or similar - you press the stated key while that line is on the screen to boot from the CD.
If you choose the Repair installation of Windows method, Windows Setup will Restart the computer several times automatically.
DO NOT press the key to boot from the CD while booting once Windows Setup has started.
If you DO press the key to boot from the CD while booting after Windows Setup has started, the process of loading files from the CD again will start over from the beginning, and you will have lost the choice to do a Repair installation of Windows.
NOTE that if the laptop has a SATA hard drive, the initial files loaded by the XP CD may NOT find the SATA hard drive, depending on settings in the bios.
If the SATA hard drive is not detected, go into the bios Setup and find the setting for the SATA drive controller mode, and set it to an IDE compatible mode of some sort, Save bios settings, then the initial files loaded by the XP CD WILL detect the SATA drive, as an IDE compatible drive.
I / we probably can't tell you which specific setting it is because we usually can't find that info for what you see in a brand name system bios version in Setup, but whatever it is it's presently set to SATA or AHCI, it's changeable, and at least one other choice is some sort of IDE compatible mode.