Change Registered Company and User Names
When you first install Vista you choose your registered company and user names but there is no GUI interface to updating these values. However, if you'd like to update the information you can do so from the registry:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion
RegisteredOwner is the user name
RegisteredOrganization is the company name
From the command line:
User Name:
reg add "HKLM\Software\Microsoft\Windows NT\CurrentVersion" /v RegisteredOwner /d "Bob Kelly" /t REG_SZ
Company Name:
reg add "HKLM\Software\Microsoft\Windows NT\CurrentVersion" /v RegisteredOrganization /d "www.realtime-vista.com" /t REG_SZ

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Comments
I was going to give a desktop Vista computer to a foreign student, but I gave him a laptop instead and gave the desktop Vista to my wife.
However his name is under C:\Users -- throughout the computer -- Moses Omane-Bwatin.
I did what you said in this article but this changed very little. Moses name is still all over the computer.
http://www.realtime-vista.com/administration/2007/06/change_registered_company_and.htm
Just one example found under:
HKEY_LOCAL_MACHINE\SIFTWARE\Classes\Installer\Products etc.
NAME
ab1
TYPE
REG_EXPAND_SZ
DATA
C:\Users|MOSESO~1\App/Data\Local\Temp\7zS2F6A.tmp
\setup\DocProc\
Moses name is on the Registry about 50 times
Please help me substitute my wife's s name and get Moses off completely -- Moses is always under C:\Users
Melvin Bertrand
403 Preston Drive
Pottsboro TX 75076
bertrandgcc@yahoo.com
903-786-3172
Posted by: Melvin Bertrand | June 25, 2007 8:20 PM
If the person has installed software, you'll be dealing with application specific things that cannot easilly be changed by the system. I would not get hung up on how often it is in the registry-- if it pops up someplace you want it changed, then you have something to focus on. But the registry is a bad thing to focus on here. One way you can get rid of a bulk of the old user's registry entries is to delete their profile from the system:
Navigate to: Control Panel\User Accounts and Family Safety\User Accounts and click "Configure advanced user profile properties" in the left sidebar. Then select and delete the user's profile from here.
Posted by: Bob | June 28, 2007 9:47 PM
For removal of Moses' name you could try downloading a Regedit Search and Replace Tool, for example REGREPLACE, then use that to search for Moses and replace it with what name you want. Be careful if you are not familiar with the Registry. But it worked for me. Good luck.
Posted by: Glennie | September 14, 2007 12:05 PM