|If you installed SP2 after the fact then it can be found in Control Panel> add/remove programs. You may need to check the box to show updates in order to see it. Is the reason you want to remove SP2 because you are getting a message that the version of WinXP on the CD is older than the installed version?|
Your other option is to sliptream SP2 or SP3 into the files on your WinXP CD. nLite OS can easily perform that if you have access to the internet and a CD writer/program on the same computer.
Go to the link below to download nLite.