I'm going to assume that you are on Windows 10, here's a quick guide to find what antivirus you are using:
press the windows key on your keyboard or the start button on the bottom left, then write virus
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Open the shown Virus & threat protection.
On the right side, select the Manage providers link under "Who's protecting me?"
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There you will find the information you are looking for
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Post a screenshot or let us know what antivirus you are using so we might help you.