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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?

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.

Instructions on how to disable Windows Defender can be found here. If you face problems while disabling Windows Defender manually, please contact our technical support service.

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