If some Windows functions aren't working or Windows crashes, use the System File Checker to scan Windows and restore your files. Though the steps below might look complicated at first glance, just follow them in order, step-by-step, and we’ll try to get you back on track.

Microsoft support is here to help you with Microsoft products. Find how-to articles, videos, and training for Microsoft Copilot, Microsoft 365, Windows, Surface, and more.

Follow these steps to automatically diagnose and repair Windows security problems by turning on UAC, DEP protection, Windows Firewall, and other Windows security options and features. Select the Download button on this page.

Your PC isn't working well and you recently installed an app. Restore from a system restore point. You suspect your device has been infected. Use installation media to reinstall Windows 11. Select one of the recovery options below and follow the steps to try to get things working again.

Avoid and report Microsoft technical support scams. Learn how to unlock your Microsoft account and resolve 'account has been locked' error message.

Check the Xbox services, games, and apps for any service outages.

The Microsoft .NET Framework 4.8 is a highly compatible, in-place update to the Microsoft .NET Framework 4, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1 and 4.7.2. The offline package can be used in situations in which the web installer cannot be used because of lack of Internet connectivity.

您的目录数据（姓名、注册日期和电子邮件）可能会显示给管理员以及您所在组织的其他服务用户。. 当您使用 Microsoft Teams（免费版）的社交功能时，您所在组织的其他最终用户可能会看到您的某些活动。. 如要了解有关社交功能和其他功能的更多信息，请查阅 ...

Filter junk email and spam in Outlook. Office for business Office 365 Small Business New Outlook for Windows More... Mail identified as possible junk email can be automatically moved to the Junk Email folder. Any malware—potentially malicious software or code—is disabled.

尝试在 Xbox 网络上使用功能时看到以下错误代码：. 0x80072F8F. 这可能意味着与 Xbox 服务的连接存在问题。. 通常，这是一个暂时性错误。. 如果在主机系统更新期间或在主机设置过程中收到此错误，请参阅：. Xbox 系统更新疑难解答.