Use the System File Checker tool to repair missing or corrupted system files. When critical Windows system files are missing or corrupted, some Windows features may stop working correctly or Windows may stop responding altogether.

Get Help has troubleshooters you can run for many common scenarios. These often help resolve issues without the need to contact support. If a troubleshooter is available for your issue, select Run to start that troubleshooter.

To access the code, you'll need a tool for reading MSI files—which is typically available to IT professionals. You'll find the product code in the property table of the MSI file. The troubleshooter helps fix problems that: Corrupt registry keys on 64-bit operating systems. Corrupt registry keys that control the update data.

System File Checker is a utility in Windows that checks for problems with files on your computer. To run it, follow these steps: Make sure you've installed the latest updates for Windows, and then restart your machine. To find out more, read Update Windows.

当关键的 Windows 系统文件丢失或损坏时，某些 Windows 功能可能会停止正常工作，或者 Windows 可能会完全停止响应。 如果发生这种情况，可以使用部署映像服务和管理工具 (DISM) 和系统文件检查器工具 (SFC) 扫描系统文件并还原任何损坏或丢失的文件。 DISM 提供修复损坏的文件所需的文件。 应在运行系统文件检查器之前运行 DISM。 为此： 打开提升的命令提示符。 在 “搜索 ”框中键入 cmd。 在搜索结果中，右键单击“ 命令提示符 ”，然后选择“ 以管理员身份运行 ”。 如果系统提示确认或管理员密码，请键入密码，或单击“ 允许 ”。 在 “命令提示符” 窗口中，键入以下命令，然后按 Enter。 完成命令操作可能需要几分钟时间。

This update makes improvements to Windows setup binaries or any files that setup uses for feature updates in Windows 11, version 24H2 and Windows Server 2025. Install this update. To install this update, use one of the following release channels. This update is available through Windows Update. It will be downloaded and installed automatically.

To access the code, you'll need a tool for reading MSI files—which is typically available to IT professionals. You'll find the product code in the property table of the MSI file. The troubleshooter helps fix problems that: Corrupt registry keys on 64-bit operating systems. Corrupt registry keys that control the update data.

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. In the File Download dialog box, click Run or Open, and then follow the steps in the Windows Security Troubleshooter. Notes:

You can start a scan for malware any time you like. Note: Microsoft Defender currently offers anti-malware on Windows, Android, and macOS. From the Microsoft Defender dashboard. If you want a deeper scan, instead of selecting Quick scan in step 3, select Scan options and choose the type of scan you want.

These new features will remain dormant until they are turned on through the “enablement package,” a small, quick-to-install “master switch” that activates the Windows 10, version 22H2 features.