Learn how to scan and repair missing or corrupted system files in Windows using the System File Checker tool (sfc/scannow). Follow the steps to run the tool, view the scan results, and manually replace the corrupted files if needed.

Learn how to switch out of S mode in Windows 11 or Windows 10 to install apps from outside of the Microsoft Store or to upgrade to Windows 11. S mode is only available in Windows 11 Home edition and is not available in Windows 11 Pro, Enterprise, or Education editions.

Learn how to use the PC Health Check app to see if your device meets the system requirements for Windows 11 after changing hardware. Find out how to manually refresh the eligibility assessment and troubleshoot issues with the app.

Find out how to download and install Microsoft 365 or Office 2019, 2016, or 2013 on your PC or Mac. Follow the steps to sign in, choose your language and bit version, and activate your product.

Learn how to access SharePoint, a browser-based app for online collaboration and document management, through your web browser. Find out how to check your subscription, troubleshoot issues, and get training for SharePoint.

Learn how to view, install, and change settings for add-ins that enhance your productivity in Excel, PowerPoint, and Word. Find out how to deal with add-in security, compatibility, and device access issues.

若要在 Windows 11 中检查激活状态，请选择“开始 ”按钮，然后选择“设置 > 系统 ” ，然后选择“激活 ”。 。 激活状态将在“激活”旁边列出。 在“设置”中检查激活状态. 你将在“激活”页面上看到以下一条激活状态消息：

Learn how to get a refund for digital game products purchased on Xbox consoles, PC, or mobile devices. Find out the eligibility criteria, guidelines, and resources for refund requests.

Learn how to remove a device from the Phone Link app on your Android or Surface Duo device and your PC. Follow the steps for both devices and sign out of your Microsoft account online.

如果这是你第一次安装 Microsoft 365，则可能需要先执行一些设置步骤。展开下面的 “了解详细信息”部分。 但是如果是重新安装 Microsoft 365，且已兑换了产品密钥并拥有与 Microsoft 365 相关联的帐户，请转到“登录并安装 Office”的部分。