Find help and how-to articles for Windows operating systems. Get support for Windows and learn about installation, updates, privacy, security and more.

Learn how to redeem a gift card, code, or Office product key and spend your balance at Microsoft Store online, on Windows, or Xbox.

Access, download, or run the Surface app and the Surface Diagnostic Toolkit to help find and solve Surface problems.

If there was an unusual sign-in attempt for your account, you'll get an email or text message. We'll send a message to all your alternate contact methods.

Learn how to enable Adobe Flash in Microsoft Edge. By pressing submit, your feedback will be used to improve Microsoft products and services.

Learn how to install Windows 7 Service Pack 1 (SP1). Includes info about how to get the download, requirements, and more.

If you're having problems with your Surface Pro model, Surface 3, Surface Studio, or Surface Book, try fresh start, restoring, refreshing, or resetting it to its factory settings.

How to use the SUMIFS function in Excel, one of Excel’s math and trig functions, to add arguments that meet multiple criteria.

You can insert a drop-down list of valid entries (also called a drop-down menu or drop-down box) in Excel to make data entry easier, or to limit entries to certain items that you define.

Create a system restore point. Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.