I am not sure if the service packs or the critical updates really matter download this to the
RapidShare: Easy Filehosting which is a simple program that will download all of the critical updates that are listed on the WindowsUpdate.log file ,download all of your drivers then nlite everything to a ISO, burn it and reinstall a fully updated Winxp with all of the updates and your drivers. but that is if I was him( or her) and decided to reinstall the whole OS again.