What does activating Windows XP do?

Answer 1

To use Windows XP you first need to activate it and product activation reduces software piracy. Windows XP needs activating within 30 days of usage. It can be activated by using the internet and also by phone by calling a customer service representative on a toll free number.

Answer 2

Windows Product Activation was created as an anti-piracy measure. Before, you only needed to enter a product key to use Windows. But since a product key could easily be posted on the internet and used by a large number of people, Microsoft needed product activation. Activation checks to see if the product key you are using is unique and not a blacklisted one that is used by a large number of people

Answer 3

Activation checks with Microsoft to make sure that your copy of Windows is genuine. If you do not activate Windows, you will receive annoying nag messages.