Learn how to manage changes for Windows DCOM Server Security Feature Bypass (CVE-2021-26414) and test for compatibility issues with DCOM hardening. See the timeline, error events, and registry settings for the updates released on June 8, 2021, June 14, 2022, and March 14, 2023.

Learn how to update your Windows system to enable TLS 1.1 and TLS 1.2 as default secure protocols in WinHTTP for SSL connections. Download the easy fix tool or follow the registry instructions to configure the DefaultSecureProtocols and SecureProtocols entries.

Fixes an issue in which BITS peer caching does not work in a domain environment. This issue occurs in Windows Vista or in Windows Server 2008 when a disjoint namespace exists in the domain.

Learn how to protect Windows systems against L1TF, MDS, and other variants of speculative execution side-channel vulnerabilities that affect Intel processors. See the CVEs, security advisories, and mitigation options for each vulnerability.

Learn how to use the Windows Security Troubleshooter to diagnose and repair Windows security problems by turning on UAC, DEP, Windows Firewall, and other features. Download the troubleshooter and run it on the affected computer or a flash drive or a CD.

Learn how to use the Program Install and Uninstall troubleshooter to fix corrupted registry keys, prevent programs from being installed or removed, and access the product code. The troubleshooter runs on Windows 10, 8.1, 8, and 7.

Regsvr32 is a command-line utility to register and unregister OLE controls, such as DLLs and ActiveX controls in the Windows Registry. Learn how to use the Regsvr32 tool, troubleshoot common errors, and run it from an elevated command prompt.

Learn how to fix common issues with older programs that were created for earlier versions of Windows. Use the compatibility troubleshooter, adjust compatibility settings, or check the system requirements for your apps.

The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component.

Learn how to use the Microsoft .NET Framework Repair Tool to fix issues with .NET Framework setup or updates. The tool supports command line options and offline repair mode for different .NET Framework versions.