Learn how to check for, download, and install KB 2919355, an update for Windows 8.1 and Windows RT 8.1.

Learn how to change your notification settings and quick actions using the notification center in Windows.

了解如何更改 Windows 中显示器的刷新率，以确定在屏幕上显示运动的平滑程度。

Manually download a language for Cortana speech. Go back to Settings > Time & language > Language, select your new language, and then use the up-arrow button to move it to the top of the list and make it the default.

Learn how to identify a phishing scam, designed to steal money via fake emails.

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Learn how to download files from the web, change your default download location, and find files you've downloaded on your PC using Internet Explorer.

Learn how to log in to Microsoft Teams using our step-by-step guide. Stay connected with your team and start collaborating!

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 turn on HDR video streaming to watch high dynamic range (HDR) content on your Windows PC.