CPU Usage Maxing out

Hello.  Visitor from the distant land of /trv/ here.

I'd like to ask if any of you know why I'd be suddenly running into CPU usage running up to flatline at 100% after an hour or so online.  It happens on Firefox, IE or Chrome, and regardless of what site I visit.  It happens every time. I'm running a mid-range Dell with Windows 7 on it.  Norten antivirus and Spybot S&D pick up nothing.

My ignorance on this matter is profound, any advice appreciated -- and if help me I am ignorant and my computer is broke threads are frowned on here, just lemme know and I'll delete it.

It might also be worth mentioning that, after closing any and all browsers, the CPU usage stays at 100% for several hours.

Mistakes: 1 Your using a Dell.
2 You have Norton.

As for the problem, have you ever tried opening up task manager, then opening up the resource monitor?

What I would say is when you open your task manger, Check to see what is running. ( Hit processes ) Then after you do that, hit the memory box so you see what is using the most memory, then after you do that, see whats running and also very important hit the Show processes from all users so you see everything. Then just find out whats running and go from there.

norton uses a lot of cpu
its sucks

>4 he asked for CPU, memory is RAM

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