You receive an "Invalid Product ID" error message when you try to validate Windows on a Windows Embedded for Point of Service-based or a Windows XP Embedded-based computer

Method 1: Turn on Automatic Updates

1. Click Start, click Run, type sysdm.cpl in the Open box, and then click OK.
2. Click the Automatic Updates tab, and then click either Automatic or Download updates for me, but let me choose when to install them.
3. Click Apply, and then click OK.

Method 2: Use Windows Update Catalog

1. Visit the following Microsoft Web site:
   http://catalog.update.microsoft.com/v7/site/Home.aspx
2. Click Find updates for Microsoft Windows operating systems.
3. In the Operating system box, click the operating system that you use, and then click Advanced search options.
4. Click to select the following check boxes:
   • Critical Updates and Service Packs
   • Advanced Security Updates
5. Click to clear the following check boxes:
   • Additional Windows Downloads
   • Internet and Multimedia Updates
   • Multi-Language Features
   • Recommended Updates
   • Windows Tools
6. Click Search, and then click Critical Updates and Service Packs.
7. Click Add next to each item that you want to download.
8. Click Advanced Security Updates, and then click Add next to each item that you want to download.
9. Click Go to Download Basket.
10. In the Type or browse to the download location of your choice box, click Browse, and then click the folder in which you want to save the downloads.
11. Click Download Now, and then click Accept.