malware virus
i think i have a virus on my mac i'm using an os x ei capitan version 10.11.6 this thing keeps popping up saying a have a virus and that my computer is locked and not to ignore this but i'm able to x it out and go back to using my computer it want me to call a # 877-416-1497 trojan backdoor hijack #365838d7f8a4fa5 can anyone tell me of a good way to get rid of this maybe to download a good malware remover or some kind of security download i can use ti prevent this thank you very much
iMac (21.5-inch, Late 2013)