If you were using the built in Administrator account:
XP Pro: Press CTRL-ALT-DEL twice at the Welcome Screen, with no other users logged in. You'll get the old Win2K style dialog.
XP Pro: Alternate: To enable the Administrator account on the new Windows XP logon screen, visit my web site,
www.dougknox.com and go to the Windows XP section. Follow the link for Enable Administrator Account ......
This small VB Script will make the registry change necessary for the Administrator account to be available on the Welcome Screen. If you prefer to do it manually, click Start, Run and enter REGEDIT Navigate to:
XP Home: Boot the computer into Safe Mode, and you'll see the Administrator account on the Welcome Screen.
Additionally:
Copy a User Profile:
Open System in Control Panel. On the User Profiles tab, and under Profiles stored on this computer, click the user profile you want to copy, and then click Copy To.
In the Copy To dialog box, under Copy profile to, type the location for the new profile, or click Browse to select the path.
Click Change to open the Choose User dialog box, click a new user from the Names list, and then click Add. The new user name will appear in Add Name. Click OK to add the user as a new user profile on your computer.
Note: You must be logged on as an administrator to the local computer to copy user profiles. To open a Control Panel item, click Start, point to Settings, click Control Panel, and then double-click the appropriate icon.
http://support.microsoft.com/default.aspx?scid=kb;en-us;811151
How to Copy User Data to a New User Profile
NOTE: You cannot copy to or from the account you are logged onto.