This cumulative update for Windows Server 2025 (KB5075899), includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. To learn more about differences between security updates, optional non-security preview updates, out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained. For information ...

Describes how to use the System File Checker tool to troubleshoot missing or corrupted system files in Windows.

The Windows Security app is a comprehensive security solution integrated into Windows, designed to protect your device and data from various threats. It includes features such as Microsoft Defender Antivirus, Windows Firewall, and Smart App Control, which work together to provide real-time protection against viruses, malware, and other security threats. The app is built into Windows, ensuring ...

Microsoft Support is here to help you with Microsoft products. Find how-to articles, videos, and training for Microsoft Copilot, Microsoft 365, Windows 11, Surface, and more.

Describes how to troubleshoot problems that occur when you install, uninstall, or upgrade a program on a Windows-based computer by using Windows Installer.

Find and open File Explorer in Windows, and customize Quick access by pinning and removing files and folders.

NOTE Improved diagnostics have been added to detect and report issue details through the event log. Please see KB5016061: Addressing vulnerable and revoked Boot Managers for more information.

Learn how to troubleshoot when the camera is not working in Windows or you see errors 0xA00F4244 or 0x200F4244.

PC Health Check app brings you up to date info on your Windows device health, helping you take action to improve your device performance and troubleshoot performance problems. It is periodically updated based on customer feedback to help you make the most of your Windows PC.

Learn how to use Narrator, a screen-reading app built into Windows, with this complete guide and how-to articles.