Are you going to sell your computer to someone else, and do not want to have your personal information stored on it? Well, you have plenty of other steps, but here is how you change the registered owner of the computer.
* open the registry edit (start, run, regedit)
* navigate to [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT] and then to [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\CurrentVersion]
* Change the keys for RegisteredOwner and RegisteredOrganization