Click Start > Run
Type in "regedit" without open and close quotations
Expand HKEY_LOCAL_Machine
Expand Software
Scroll down to "Microsoft" and expand it
Scroll down to "Windows NT" and expand it
Select "CurrentVersion"
In the right Pane you will see a listing on Keys.
The 2 you are looking for in particular are "RigisteredOwner" and
"RegisteredOganization".
Double click "RegisteredOwner", a dialog will appear.
Under "Value data:"
Type in your user name of choice.
The same can be applied to "RegisterOrganization".