You should now see the Let's activate Windows window.
Choose the Yes, I want to telephone a customer service representative to activate Windows radio button and then click the Next button.
Note: You won't actually be activating Windows XP via the telephone at this time. This is just the step you have to take right now to get to the area where you can change the Windows XP product key.
Important: If you don't see the screen above but instead see a message notifying you that Windows XP is already activated, you may not have properly changed the OOBETimer value in which case you should start this process over.
If that still doesn't work, which is not uncommon, you should try changing the Windows XP product key with Winkeyfinder, a popular free product key finder program that can also change the XP product key. I like this manual process better since there's nothing to download but if it doesn't work for you, give Winkeyfinder a try.