well it certainly looks as if your cpu is running at an acceptable temperature. and I have to admit, I overlooked your statement that without LimeWire your box performs fine (sorry about that), but you now have a fine little utility (Everest) which will allow you to monitor what's going on inside of your box.

I would have to say that perhaps you have a virus or somesuch that is causing your problem, which means a virus scan is in order. or perhaps there is some sort of problem with the newest version of LW