About this threat
You Have A Trojan! bogus warnings are are probably caused by an adware or a suspicious website you were on redirected you. These bogus ads commonly aim to trick users into dialing supposed tech-support who would attempt to get remote access to a operating system or sell useless software or services. Advertising-supported applications can make very invasive adverts so expect the pop-ups to show up constantly. You may have ran into the adware infection if you didn’t pay attention to how you installed free software. The ads are not going to harm your system, as long as you don’t fall for the scam. The reason calling them would be a mistake is because you would be tricked out of a lot of money, or some malevolent software would be installed. You should never call the numbers in these suspicious warnings, and you should also never provide access to your OS to shady parties. And when it comes to this advertisement, just ignore it, you’re system is not in danger, neither is your data. The ads will only stop appearing if you delete You Have A Trojan!, so the sooner you do that, the better.