Hi, if you had the same irritating problem as me then read on 
When I bought my PC with XP preinstalled the main admin account was "user" and I was new to XP 6 months ago so took a few days to get used to it but after a few days I renamed the admin from "user" to "mark" but noticed that my documents folder was still named user, try renaming that folder and it won't let you, I honestly nearly got to the point of reinstalling xp (bear in my I wouldn't know how) I googled for solutions and all I got where mad suggestions which seemed far beyond my knowledge but glanced through an old mag today and my prob was solved if you do it create a restore point as always, open regedit, then "Hkey_local_machine", then "software" then "microsoft" then "windows NT" then click "currentversion" and click the keys "registered organisation" and "registered owner" to change, job done, no probs for me and I hate messing with settings good luck and hope i've helped someone
When I bought my PC with XP preinstalled the main admin account was "user" and I was new to XP 6 months ago so took a few days to get used to it but after a few days I renamed the admin from "user" to "mark" but noticed that my documents folder was still named user, try renaming that folder and it won't let you, I honestly nearly got to the point of reinstalling xp (bear in my I wouldn't know how) I googled for solutions and all I got where mad suggestions which seemed far beyond my knowledge but glanced through an old mag today and my prob was solved
if you do it create a restore point as always, open regedit, then "Hkey_local_machine", then "software" then "microsoft" then "windows NT" then click "currentversion" and click the keys "registered organisation" and "registered owner" to change, job done, no probs for me and I hate messing with settings good luck and hope i've helped someone 
