Fix problems that block programs from being installed or removed
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.
Uninstall or remove apps and programs in Windows - Microsoft Support
There are different ways to remove apps and programs, so if you can't find the one you're looking for, you can try another location. Note that some apps and programs are built into Windows and can't be uninstalled. You can try to repair a program first, if it's just not running correctly.
List of security program cleanup and uninstall tools
Provides links to the uninstall tools and directions for many security programs.
Windows troubleshooters - Microsoft Support
Get Help has troubleshooters you can run for many common scenarios. These often help resolve issues without the need to contact support. If a troubleshooter is available for your issue, select Run to start that troubleshooter.
System Restore - Microsoft Support
With System Restore you can revert your PC's state to a previous point in time. This can be particularly useful when troubleshooting issues caused by recent changes, such as software installations, driver updates, or system settings modifications.
Install or reinstall classic Outlook on a Windows PC
To install a standalone version of classic Outlook for Windows, select your language from the dropdown, and then select Download. Follow the prompts to complete the installation. Which language do you need? Tip: You can also try installing classic Outlook from the Microsoft Store.
Applies To:
New Outlook for Windows
How to start a scan for viruses or malware in Microsoft Defender
Here's how to do that on Windows, Mac, or Android.
Applies To:
Microsoft Defender on Android, Microsoft Defender on Mac, Microsoft Defender on Windows
Microsoft Defender update for Windows operating system installation ...
Extract this .zip file to get the Defender update package (defender-dism- [x86|x64|arm].cab) and an updating tool (DefenderUpdateWinimage.ps1) that assists the update operation for OS installation images. The following prerequisites apply to running this updating tool (DefenderUpdateWinImage.ps1):
Installing Microsoft Defender - Microsoft Support
Protect your Android, iPhone, Mac, and Windows devices from threats by installing Microsoft Defender. Download Microsoft Defender on your devices either by: We encourage you to install Microsoft Defender on at least five devices per person. Ready to give it a try?
Applies To:
Microsoft Defender on Android, Microsoft Defender on iOS, Microsoft Defender on Mac, Microsoft Defender on Windows
Automatically fix Windows security issues - Microsoft Support
Troubleshoots and fixes common issues with security and malware prevention in Windows.