Jotie's System Idle Process Problem

Okay, I've read most of the threads that had the same thing that is said towards what I just typed up there, but the thing is is that I don't get pop-ups or anything. My System Idle Process currently runs around 90-95 CPU. It currently lags my computer badly enough as it is. I restart my computer, but it seems to not work, because when I have those few ten seconds of no lag, it comes back again.

I'm currently using a Customized E-machines, but the problem is, it's a Windows XP Without Genuine, or whatever that crap is. I've followed the steps upon removing uneeded programs and the programs that I stopped that I don't need. However, the system Idle process is down to 80-95 still... So I think that may helped some.

When I try to play Final Fantasy XI on this computer, usually I don't lag too bad out in the field where there's no other people around. But currently, it's just lagging so bad, I can't concentrate on what I am doing.

I'm not much of a computer-geek, so I don't know what to do. If someone could help me, do it step-by-step please, but you don't have to do it step-by-step. Just more explain it to me to the point of a newbie to understand your answer.

Thank you for reading this. I will follow anyone's advise if you post it up.

((Oh, and if I posted this in the wrong section, please tell me and that I'm sorry.))

 

Ah, actually, I don't know how to spec my computer. All I know is that I'm running my computer at the lowest setting I can think of ((as in, having the orignal window's look)). But if you could tell me how to find it, it would be great.

I'm using a Windows XP. That's all I know truthfully.