Also make sure you have the drivers you need for your motherboard, video
card, sound card, Etc.
Try Belarc Advisor: http://www.belarc.com/free_download.html
It does a good job of providing a wealth of information including software Key codes
and Devices you will need Drivers for.
If you are doing a Clean Install on an existing PC that has XP already Installed:
Verify your CD Key code matches what Belarc Advisor reports for your existing install.
Note: OEM Windows Installs usually come with a sticker on the PC or laptop and may not match the factory installed key.
Note: A number of vendors now supply restore CD(s) or have a restore partition on the hard drive
and usually do not supply a Windows XP CD.