Ok everytime i go on my computer i do a scan. In the morning i had 0 viruses and when i did it again today i had 75. And also while typing in some sites i saw BAD websites that were not there earlier today and the only one home is him

put a password protect on your computer and don't tell him. It is the only way to ensure that he cannot get on your computer.

then he would get mad at me. My parents already found out. So im doing a full scan to try and delte them all

You have to password protect your computer. This is the same as locking your house or car. If your neighbor came to your house and made a mess then what would you do?

He is using your computer without your permission to do things your parents do not probably approve of and which are making your computer sick. He has thus no right to be on the computer. Next time he will go to your chat group or VMK and ruin your name there. If he wants to go to unsafe and nasty site then let him do it at the library, school or his own home. Also you must show your parents what sites he has been going to so they know what he did wrong and punish him.

Family and friends ends when people abuse their priviledges and cause bad things to happen especially when people, animals or computers and personnal stuff is involved.

he lives here and is a family computer but im about to make a password and tell my other two siblings and parents