If you want to change name of owners name just follow these steps:-
First of all click on Start button then type Regedit in Run option.
Here locate the location to:
Go to HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows NT/CurrentVersionHere in right side panel, double click on RegisteredOwner and here change its value data as you wish.Now close the registry editor and restart your computer after any changesto go into effect.
So Now it is very easy to change the name of registeration information of Windows XP owner.