What Are You Trying To Accomplish?
If I Understand You Correctly are you having a problem with WinXP registry which
screwed up your login/personal settings
If I'm correct than try the Guided Help From MS.
Guided Help is available to export registry keys and to back
up the registry. Guided Help can automatically perform the
steps for you.
The actions that this Guided Help performs cannot be undone after Guided Help is finished.
Requirements to install and to use this Guided Help
You must be logged on to Windows by using a computer administrator account to install and to use this Guided Help.
You must be running an English version of Windows XP Home Edition, Windows XP Professional, Windows XP Media Center Edition, or Windows XP Tablet PC Edition to install and to use this Guided Help.
PS:Please visit the above link to download Guided help