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. Note: Use these steps for Windows programs.

Find out what to do if your game crashes because of your antivirus software on Windows 10.

Microsoft Defender Antivirus (offline scan): Uses the latest definitions to scan your device for the latest threats. This happens after a restart, without loading Windows, so any persistent malware has a more difficult time hiding or defending itself.

Some user machines that have upgraded from Windows 10 and are now running Windows 11, version 21H2 or higher which have a fingerprint sensor with certain ELAN fingerprint drivers could encounter a failure or crash when using applications which rely on related DLLs. Which drivers are these?

Find out the steps you can take if you receive a message telling you a driver can't load on your device.

In the Windows Security app on your PC, select App & browser control, or use the following shortcut: App & browser control. Smart App Control adds significant protection from new and emerging threats by blocking apps that are malicious or untrusted.

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 that your device is protected from the moment you start it up.

Microsoft Defender for Endpoint on Windows Server 2012 R2, Windows Server 2016. This update services the EDR sensor included in the new Microsoft Defender for Endpoint unified solution package released in 2021. Installation is required before this package can be applied.

Download the drivers for the desired device from the device manufacturer's site. Make sure to download the correct drivers that match the version and architecture of Windows. Once downloaded, if necessary, uncompress the downloaded drivers. Make a note of where the drivers are located on the Windows device.