is any thing we can search through internet?????

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there ar many search sites presnt in internet, which sites we can prefer. hacking word is very famous. what is hacking. internet virouses is very harmful for our system, mainly for our programs. there are many anti virous present what are difference between them. when we are downloding any file at that time many virous comes to our system so that which anti virous we can use to defend our system. i am student of engineering so that many useful files present in my system when i started internet to my system at that time i had'nt any anti virous so that many virous came to my system and affect these files. so that many useful files deleted to my system.