Microsoft Security Essentials reached end of service on January 14, 2020 and is no longer available as a download.

Windows Defender and Microsoft Security Essentials are powerful scanning tools that find and remove malware from your PC. Here's how to use Windows Defender in Windows 8.1 or Microsoft Security Essentials in Windows 7 to scan your PC.

Windows 7 がサポートされなくなり、Microsoft Security Essentials の新しいインストールを利用できなくなりました。 最高のセキュリティ オプションをご提供できるよう Windows 10 および Windows Defender ウイルス対策に移行することをすべてのお客様にお勧めします。

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.

Select Device details Select Manage in Windows Security Select Quick scan Tip If you want a deeper scan, instead of selecting Quick scan in step 3, select Scan options and choose the type of scan you want. For the most complete scan, run Microsoft Defender Offline. For more about that see Help protect my PC with Microsoft Defender Offline.

Learn how to use virus and threat protection options in Windows Security to scan your device for threats and view the results.

This article describes how to identify and then remove all traces of a security program from a computer. To help prevent issues that may occur due to a conflict between programs, it is important to remove all other security programs before you install Microsoft Security Essentials (MSE).

Describes and provides links to several Microsoft security resource centers and tools that can help you protect your system from malware and from viruses.

Early launch anti-malware protection (ELAM) is a security feature in Windows that allows anti-malware software to start before all other third-party components during the boot process.

Microsoft Defender is a security app that helps people and families stay safer online with malware protection, web protection, real-time security notifications, and security tips.