How to Activate Windows XP After a System Upgrade

1. Ensure that the computer is connected to the Internet.
2. Click the 'Start' button, 'All Programs,' 'Accessories,' System Tools' and then 'Activate Windows.'
3. Select the 'Yes, let's activate Windows over the Internet now' option and then click 'Next.'
4. Select 'No, I don't want to register now; let's just activate Windows' and then click 'Next.'
5. Click 'OK' when the 'You have successfully activated your copy of Windows' message appears.