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 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...!!!!!!!!

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

Ad Aware, Spy bot - search and destroy,Spy ware Doctor are some good spy ware removers. AVG Anti virus and McAfee virus scan are also supposed to help a lot.check out http://blog.360.yahoo.com/blog-sAFtLsc8e... for more details.

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

I would get the free one like the others say, but I would recommend sooner or later getting ESET anti-virus. Very easy to use and you won't need anything else.
I would recommend this windows live safety scanner to everyone but before you use it make sure you turn off system restore.
1. Use this for a free scan to find out what virus you have http://housecall.trendmicro.com/