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 use the System File Checker tool (SFC.exe) to scan and restore Windows system files that are not working or causing crashes. Follow the steps to run SFC.exe, view the scan results, and manually replace the corrupted files if needed.

Learn how to download and install Microsoft 365 or Office 2019, 2016, or 2013 on your PC or Mac. Find out how to activate Office, troubleshoot issues, and switch languages or bit versions.

Learn how to add, remove, connect, and disconnect user accounts in Windows 10 and Windows 11. User accounts let each person have their own settings, documents, and applications, and can help with security and privacy.

Learn how to download and install Microsoft 365 apps, like Word, Excel, 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.

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 fix errors while downloading and installing Windows updates with the Update Troubleshooter. Follow the steps to run the troubleshooter, restart your device, and check for new updates.

Find solutions to common problems, or get help from a support agent for Microsoft 365, Office, Windows, Xbox, Surface and more. Sign in to get personalized help and access live chat, phone, or email options.

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。

Learn how to download and install Microsoft 365 or Office 2021 on your device, whether you have a Microsoft account, a work or school account, or a product key. Find out how to activate the apps, change the version, and get help with common issues.