You have have to completely reformat the hard disk because you can't take an XP with SP2 CD and install just XP. You can remove SP2 from the operating system, however, you have to uninstall it literally one piece at a time. Its the only way to get it done. SP2 is basically an overkill security package. It does fill alot of security loopholes, adds a firewall, and more user accessiblity options, its still too much for a lot of people, and uses up more memory. I personally dont want to use it, but I dont have a choice either. Google it and research which parts you need to delete.
"Just because I'm sitting between you idiots doesn't mean I want to go skiing!"