We recommend you use Microsoft Edge for a faster, more secure and more modern web browsing experience. Get started with Microsoft Edge. In Internet Explorer, press and hold (or right-click) any empty space in the area above the address bar. From the context menu, select Favorites bar.

The Microsoft website can help you identify counterfeit software and file a counterfeit software report if needed. Validation failure is common for versions of Windows that were purchased from an online auction site, or if Windows was on a used PC that you purchased.