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[Vatsal]

If you need to change the installation key that you used to install your copy of Windows XP you can do so by following the instructions below.

1) Click On Start
2) Click On Run
3) Type Regedit.exe and Click on ok
4) Go to the following key HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsNT\Current Version\WPAEvents
5) In the right pane, right-click the OOBETimer binary value, and then click Modify.
6) Change at least one digit of this value to deactivate Windows.
7) Close the Registry Editor
Restart your Machine
9) Click On Start
10) Click on Run
11) Type %systemroot%\system32\oobe\msoobe.exe /a and click ok
12) Click on Yes, I want to telephone a customer service representative to activate Windows
13) Click Next
14) Click Change Product key
15) Type the new product key in the New key boxes, and then click Update
16) If you are returned to the previous window, click Remind me later, and then restart the computer

Any querries or problems r most welcome...