Validating windows xp pro
Click Start | Run and enter the command: At this point, Windows will launch the Product Activation Wizard.Select the option to telephone a Microsoft customer service representative to activate Windows, as shown in Figure A, and click Next.But if you're unsure, a quick way to tell is to install Service Pack 1.
The following instructions involve editing your system registry.
Using the Windows Registry Editor incorrectly can cause serious problems that require the reinstallation of your operating system and possible loss of data.
Maybe you've been hired by an organization that installed 100 pirated copies of XP but now has a legitimate volume-licensing key (VLK).
Perhaps an end user purchased an additional retail license for XP but needs to use his original CD to install the software.
If you have XP Corporate, no activation is required and your machine should have a valid product ID. When the wizard loads this time, you should see a message indicating that your copy of Windows has already been activated.