Click Start, then choose Run.
Type “regedit” (without the quotation marks).
Double click on HKEY_LOCAL_MACHINE or click on the plus sign.
Click on Software.
Click on Microsoft.
Click on Windows NT.
Click on CurrentVersion.
Now chose the “WPAEvents” option.
Right click on OOBETimer and select Modify.
In the Edit Binary Value window, remove all the values in the value data box. Click OK and close the registry editor.
Go back to Run and type the following command without quotation marks: "%systemroot%\system32\oobe\msoobe.exe /a".
In the Activate Windows wizard, chose the second option. It should be “Yes, I want to telephone a customer service representative to activate Windows.” Click on Next.
Click on Change Product Key.
Enter your genuine key in the New Key box and click on Update.
Check whether your Windows XP is genuine (optional). Type the following command in Run without quotation marks: "oobe/msoobe /a". If a box appears saying “Windows is already activated," it means your Windows XP is genuine.
After deleting the WPATimer Value in Regedit, right click on WPAEvents. Select Permissions and set permissions to deny for all groups and users. After rebooting, the machine put the values back. If you deny permissions, it can't reset.
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