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 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.

Learn how to download and install Microsoft 365 apps like Word, Excel, Teams, and PowerPoint on your PC or Mac. Follow the instructions in the browser and sign in with your Microsoft 365 account to activate the apps.

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 check if your PC can run Windows 11, transfer your files and favorites, back up your data, and install Windows 11. Find out about new features, apps, and productivity tools on Windows 11.

Learn about Windows 11 in S mode, a version of Windows 11 that allows only apps from Microsoft Store and requires Microsoft Edge. Find out how to switch in and out of S mode, what apps and hardware are compatible, and how to use assistive technology.

Learn how to view, install, and change settings for add-ins that enhance Microsoft 365 programs with custom commands and features. Find out how to deal with add-in security, compatibility, and device access issues.

Learn how to check if your Windows 10 PC is eligible to upgrade to Windows 11 and how to download the PC Health Check app. Find out the minimum hardware specifications and the timing for upgrade rollout.

Learn about the new features and benefits of Windows 11, the latest version of the operating system. Find out how to upgrade, personalize, troubleshoot, and get support for Windows 11.

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。