This happens quite often. When I am browsing through safe websites suddenly a scary virus alert comes with a toll free number to call and it hijacks the browser. Sometimes I have to end the browser process from task manager to close the browser and get rid of that pop-up. I have not installed any malicious software on my computer.

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    Can you add a screenshot of this pop-up please? thanks. – Emadeddin Aug 24 '16 at 6:42
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    Sounds like you are infected with malware. I would recommend a complete system reinstall. – Anders Aug 24 '16 at 7:31

This is probably malvertisement, i.e. malware or scareware (like in your case) delivered inside the sites advertisement. Or you have some malicious ad-injecting browser extension installed or some ad-injection software like Superfish. Hard to tell what exactly is the case.

In the first case it might get fixed by installing an ad-blocking software, at least unless the site in question currently tries to work around ad-blocking software. In the other cases check your system for browser extension or some strange software. Note that browser extension turned malicious in the past and that ad-injecting software often comes bundled with some free software.

  • @beginner it would be nice if you wrote what it was, so another who stumbles on this question in future can benefit. – Matija Nalis Aug 24 '16 at 19:35

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