Mac.advancesystemcare.co are bogus alerts trying to convince you that there is something wrong with your device. These tech-support scams are just trying to fool you, nothing they claim is true, unless the problem is entirely unrelated. If an ad-supported program is indeed to blame, expect ads to be highly invasive. An adware is normally installed accidentally, during free applications installation. The advertisements are not dangerous, and as long as you do not fall for the scam, you will be fine. If you did call them, you would be put through to people who scam others for a living, and they would request authorization to remotely connect to your OS, do some weird fix, and then charge money, basically for nothing. Not only should you never call the numbers in these questionable advertisements, you should also never authorize access to your computer to shady parties. And if you're still concerned about the warning you are getting, it is bogus, and your system is safe. When you erase Mac.advancesystemcare.co, the warnings should go away, and you will be able to go back to regular browsing.
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