Learn how to troubleshoot Windows activation errors. Browse common activation errors and learn what you can do to fix them.

Learn how to access and manage your Windows sign in options. Use a password, Windows Hello, or a security key to unlock your device.

Learn how to use antivirus protection in Windows Security to protect your Windows PC against malware, viruses, and other threats.

You can choose which apps will start automatically when you start your device.

Learn how to download, install, and configure additional language packs for your version of Windows.

了解如何在电脑上重新安装 Windows，以及安装 Windows 后激活的工作原理。

Learn how to add a OneDrive account to your computer or mobile.

Use the Office offline installer to install Office 2016 or Office 2013 if you don't have an active Internet connection or you're having problems with slow speed or unreliable connections.

Learn what you can do if you're not receiving account aign-in verification codes.

Learn about what effect closing a Microsoft account might have on your other apps and services.