I've had this problem for quite some time now.
I've only recently noticed how much it stands out after buying a old laptop.
My PC is no where near new but nor should it be considered old the specs are in my sig if you need to know them.
Now my laptop has half the speed and half the memory but when my laptop is idle (no background progs running) it's cpu usage is about 3%
Where as when my pc is idle with no bg progs running it's around 55%.
Does anyone know what the problem may be?