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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1Can you add a screenshot of this pop-up please? thanks. – Eibo Aug 24 '16 at 06:42
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1Sounds like you are infected with malware. I would recommend a complete system reinstall. – Anders Aug 24 '16 at 07:31
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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.
Steffen Ullrich
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@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