How Can I Hack Someones Computer?

First of all, why would u want to do that ?

You can't.  And by the fact that you are asking in a place like this how to do it:- you never will.  Which is just as well really, because you are way too far down the intelligence meter to be let loose with those kinda skills.  Give up the dream and go back to school.

Upto certain extent u have to be a programmer and second u need to have dedication and walla u can hack into ALMOST any computer. U just need to create ur own virus or worms (dat can be controlled by u) and let loose into a network if u can do dat. And this is the first part secondly u should not be get caught. Cuz there is prison terms, u know. So it is bad and better u do not do such kinda stupid things.....