thank you guys,
i got the virus when i was visiting porn website. it posed as fbi asking for a fine, it is obviously fake, but when i tried to close the window i just can not close it, no matter how i try, it said my browser has been locked, i can not even shut down my mac because the safari made it unable to shut down whatsoever. when i searched for how to clean fbi virus on mac, some people said that there are some antivirus app for mac, so i went to the app store and downloaded one, its called iantivirus, finally i installed it and scanned my entire computer, but it turns out ' no threat has been found ' after 10 min fully scan.. So i went to downloaded another antivirus app called bitdefender virus scanner, and ' no malware found ' again!!!!!
are you kidding me???!!! the virus is right in front of my face, right on the desktop, i can not close it , i can not even shut down my computer, it is just waste of time on those antivirus app. btw both app are free.
guess what happened, when i just felt like I'm having too many programs running so i went to apple icon on the left side, click force quit, and then I just closed the safari including the virus one. i was like, what ???? did i just close it??? honestly i don't remember if i ever tried to force quit the virus from the apple icon before i went crazy downloading antivirus app. Maybe i did, and now i succeed because of the help of the antivirus app??? I don't know. but the virus website is gone for sure, and i can also shut down my mac now, everything seems doing good, but i am not really sure if everything is 100% healthy after this time.
Also, i can't help wondering: should human being really stop visiting porn websites???