<p>Unless you're working in a geographic region with a high rate of counterfeit software, it's unlikely the Windows XP machines you support will have invalid licenses. However even in the best-run IT shops, unauthorized software can find its way onto the desktop. An end-user may have installed a pirated copy of XP but now wants to go legal. An organization may have installed 100 pirated copies of XP but now has a legitimate volume-licensing key.</p> <p>When you come across an invalid product key problem, changing Windows XP's product key is often the most practical solution. In this IT Dojo video, Bill Detwiler, TechRepublic's Head Technology Editor, demonstrates a quick and easy registry hack that replaces an invalid Windows XP key with a legitimate one.</p> <p>Once you've watched this IT Dojo video, you can read the original TechRepublic article, print the tip, find out where to get a WMI script that automates the process, and learn more ways to resolve Windows product key problems in our <a href="http://blogs.techrepublic.com.com/itdojo/?p=116">IT Dojo Blog</a>.</p>