After you install any vendor’s anti-virus, Windows Defender is not disabled; it switches to the passive mode. This option is regulated by Windows; no anti-virus installed in your system (including Dr.Web) can affect Windows Defender's operation. This is one of Microsoft's requirements.

All versions of the Dr.Web anti-virus are tested by Microsoft. During the testing process, Microsoft specialists confirm whether an anti-virus meets all their requirements. Abnormal behaviour of Windows Defender may indicate operating system problems or that some third-party software you installed has compatibility issues with Dr.Web. In such situations, we recommend that you contact Doctor Web's technical support service for a thorough analysis of the situation.

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— The Russian developer of Dr.Web anti-viruses

— Doctor Web has been developing anti-virus software since 1992

— Dr.Web is trusted by users around the world in 200+ countries

— The company has delivered an anti-virus as a service since 2007

— 24/7 tech support

Doctor Web is the Russian developer of Dr.Web anti-virus software. Dr.Web anti-virus software has been developed since 1992.

2-12А, 3rd street Yamskogo polya, Moscow, Russia, 125124

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I installed the Dr.Web anti-virus. During the installation process, it was supposed to disable the built-in Windows Defender anti-virus. However, it remains active. Why?

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