Microsoft security help and learning
Get security info and tips about threat prevention, detection, and troubleshooting. Including tech support scams, phishing, and malware.
Troubleshooting update issues for Microsoft Security Essentials
Troubleshoot problems with updating virus and spyware definitions for Microsoft Security Essentials.
Real-time protection won't turn on in Microsoft Security Essentials
Describes how to resolve an issue where another security program has been installed on the computer and iw causing a conflict with Microsoft Security Essentials.
Virus and Threat Protection in the Windows Security App
Learn how to use virus and threat protection options in Windows Security to scan your device for threats and view the results.
Unprotected computer message reported from Microsoft Security Essentials
Describes three methods that you can use to resolve an issue where Microsoft Security Essentials appears to be running correctly, but then reports that the computer is unprotected.
Stay Protected With the Windows Security App - Microsoft Support
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 …
Microsoft resources and guidance for removal of malware and …
Describes and provides links to several Microsoft security resource centers and tools that can help you protect your system from malware and from viruses.
How to start a scan for viruses or malware in Microsoft Defender
Select Device details Select Manage in Windows Security Select Quick scan Tips: If you want a deeper scan, instead of selecting Quick scan in step 3, select Scan options and choose the …
Installing Microsoft Defender - Microsoft Support
Microsoft Defender is a new security app that helps protect you and your family across all your devices; Windows, Android, Mac, and iOS.
Automatically fix Windows security issues - Microsoft Support
Oct 14, 2025 · Follow these steps to automatically diagnose and repair Windows security problems by turning on UAC, DEP protection, Windows Firewall, and other Windows security …
What's new in Windows Security - Microsoft Support
Stay safer with real-time notifications, security tips, and identity theft monitoring that help keep you ahead of hackers and scammers for your peace of mind.