When critical Windows system files are missing or corrupted, your operating system may begin to malfunction. Common symptoms include Windows features not working properly, system errors, or Windows becoming unresponsive or freezing.

After October 14, 2025, Microsoft will no longer provide free software updates from Windows Update, technical assistance, or security fixes for Windows 10. Your PC will still work, but we recommend moving to Windows 11. Learn more.

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 get the standalone package for this update, go to the Microsoft Update Catalog website.

Learn more about this Safe OS Dynamic Update, including improvements and fixes, any known issues, and how to get the 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 get the standalone package for this update, go to the Microsoft Update Catalog website.

Learn more about update KB 4513661, including improvements and fixes, any known issues, and how to get the update.

This update makes improvements to the "Safe OS" that is used to update the Windows recovery environment (WinRE) for Windows 10, version 2004, 20H2, and 21H1. This update is available through Windows Update. It will be downloaded and installed automatically. Prerequisites. There are no prerequisites to apply this update. Restart information.

To get the standalone package for this update, go to the Microsoft Update Catalog website. You can import this update into WSUS manually. For more information, see the Frequently Asked Questions topic on the Microsoft Update Catalog website for instructions. Prerequisites. There are no prerequisites to apply this update. Restart information.

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 get the standalone package for this update, go to the Microsoft Update Catalog website.

To install this update, use one of the following release channels. This update is not available through Windows Update. See the Update Catalog release channel. To get the standalone package for this update, go to the Microsoft Update Catalog website.