How to Change Volume License Product Key on Windows XP System

Deactivate Windows

1. At first click Start then click” Run“.
2. Type “Regedit” in the run box and click “Ok“.
3. Then your “Registry Editor” box open on your screen.
4. In Registry Editor box just find “HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsNT\Current Version\WPAEvents“.
5. From the right pane, right-click on OOBETimer and select Modify.
6. Change any one digit of this value and Widows will get deactivated.

Reactivate Windows and change product key

1. At first click “Strat” and click “Run“.
2. In run box type – “%systemroot%\system32\oobe\msoobe.exe /a” and click ok.
3. Then click yes “I want to telephone a customer service representative to activate Windows” and then click “Next“.
4. Then click on Change product key.
5. Then just enter new product key in the box and then click on Update. If the previous window appears again, click on “Remind me Later” and restart your computer.

After the computer has restarted, repeat the same step to see the Windows activation confirmation.A message will shown : Windows is already activated. Click OK to exit.