How to change Windows xp product key?

Change Windows xp product key:-
You can change your windows xp product key without reinstalling your windows xp operating system.
So just follow the following simple steps:-..... 1.Goto start menu,run,type regedit

2.In registry editor goto

HKEY_LOCAL_MACHINESOFTWAREMICROSOFTWINDOWS NTCURRENT VERSIONWPA EVENTS

3.In the right panel open OOBE Time

4.Edit/Change atleast one entry there,press OK and close registry editor.

5.In run type the following command

%systemroot%system32oobemsoobe /a
and press enter

6.Activation wizard appears

7.Select activation by phone and in the next screen select the option CHANGE PRODUCT KEY,enter a valid corporate product key,press OK and close the wizard

8.Reboot the computer and type the same command in the run

9.Activation wizard appears again and it shows the message WINDOWS IS ALREADY ACTIVATED..