The reason
WARNING WITHOUT ANTIVIRUS, YOUR SYSTEM IS AT HIGH RISK advertisements are appearing is because of an ad-supported program infection. It is a scam that will possibly attempt to to make you call Tech support so that scammers could sell you ineffective software or gain access to your OS remotely. If an adware is behind these adverts, they will be very intrusive, pop up over and over again, no matter how many times you close them. An adware may commonly be installed accidentally, during freeware installation. You just need to not fall for these scams, the ads are harmless themselves. If you did call them, you would have to deal with professional scammers who would ask for permission to remotely connect to your machine, do some unneeded tampering, and then charge money, essentially for nothing. Permitting some dubious technicians to have remote access to your computer could turn out badly, so be cautious. And when it comes to this warning, don't pay any attention to it, it is not real. When you eliminate WARNING WITHOUT ANTIVIRUS, YOUR SYSTEM IS AT HIGH RISK, the advertisements should go away, and your browsing will no longer be interrupted.
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