How do I get rid of a virus Bit Defender does not see?

When I start my computer I get a notification in the lower right corner of my screen that I have five viruses. If I click to close the notification I go to a Bitdefender-Blocked website. While I am running I get a pop-up suggesting all sorts of things, one at a time, including adult sites. Really annoying. Really worrisome. How can I get rid of this?

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