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Change Windows XP Serial Number

If you downloaded accidentally purchased a pirated copy of Windows XP and find that you cannot update it, you might have to enter a new valid serial number

You need to edit the Windows registry to do this so its recommended to make a Restore Point just in case you mess the things up.

Be careful though, if you make any error while editing the registry, you can potentially cause Windows to fail or be unable to boot, requiring you to reinstall Windows. Edit the registry at your own risk and always back up the registry before making any changes.

Having said that, lets get started:

Go to Start > Run, type regedit and press Enter

Go to HKey_Local_Machine\Software\Microsoft\WindowsNT\Current Version\WPAEvents

Double click on oobetimer and change at least one digit of this value to deactivate Windows.

Go to Start > Run (again) and type %systemroot%\system32\oobe\msoobe.exe /a

This will bring up the Activate Windows window. Click “Yes, I want to telephone a customer service representative to activate Windows” and then click Next.

Click Change Product Key and enter your downloaded legally purchased serial number for your Windows XP.

Now just click Update, close the window and reboot your computer.

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