Use this tool to find and remove specific prevalent threats and reverse the changes that they made (see Covered malware families). For comprehensive malware detection and removal, consider using Windows Defender Offline or Microsoft Safety Scanner.

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To install this update, use one of the following Windows and Microsoft release channels. This update downloads and installs automatically from Windows Update and Microsoft Update. This update downloads and installs automatically from Windows Update for Business in accordance with configured policies.

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.

When you install, uninstall, or update a program on a Windows-based computer, you may receive one of the following error messages. The Windows Installer Service could not be accessed. Windows Installer Service couldn't be started. Could not start the Windows Installer service on Local Computer. Error 5: Access is denied.

In Microsoft Store, select Library. Find the app you want to reinstall, and then select Install. Select the Close (X) button in the upper-right corner of the app window to close it. Then, reopen the app. Make sure Windows has the latest update: Select check for updates now, and then select Check for updates.

Find out how to resolve issues with the Easy Anti-Cheat tool for Gears of War 5.

Microsoft Windows Installer is a component of your Windows operating system that provides a standard foundation for installing and uninstalling software. Software manufacturers can create their product setup to use the Windows Installer to make software installation, maintenance, and uninstallation straightforward and easy.

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.

How to obtain this update. This update is available from Windows Update. For more information about how to run Windows Update, see How to get an update through Windows Update. The following files are available for download from the Microsoft Download Center.