How do i get rid of virus from my computer without purchasing any antivirus software?

i accidentaly went to an adult porn site and i think my computer has got infected with virus. every time i open the computer , a message appears which says that virus threats have been found in my computer and whenever i try to clean my computer they say that i hvae to buy an antivirus software. how do i get rid of... show more i accidentaly went to an adult porn site and i think my computer has got infected with virus. every time i open the computer , a message appears which says that virus threats have been found in my computer and whenever i try to clean my computer they say that i hvae to buy an antivirus software. how do i get rid of the virus in my computer. i can't purchase it cuz then i have to tell my parents. they'll get really angry if they get to know that i opened the computer without their permission. Is there anyway by which i can get rid of the virus for free without my parents knowing.........................i'm in trouble...........plz help...!!!!!!!!
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