Learn how to troubleshoot Windows Media Player errors. Explore resources for general help with Windows Media Player.

Follow these steps to temporarily turn off Defender antivirus protection in Windows Security. Keep in mind that if you do, your device may be vulnerable to threats.

Learn how to turn on device encryption, or standard BitLocker encryption in Windows.

Windows Security is pre-installed on Windows 10 and ready for you to use at any time.

Learn about the recovery options in Windows. Find out how to reset your PC, go back to a previous version of Windows, or use media to reinstall Windows.

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

了解如何使用产品密钥或数字许可证激活 Windows、检查激活状态，以及链接Microsoft 帐户。

Contact Microsoft Support. What's new. Surface Pro; Surface Laptop; Surface Laptop Studio 2

Learn how to manage extensions in Microsoft Edge, including adding, disabling, or removing them as needed.

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