There are hundred reasons such as Windows is checking for updates, rearranging memory, the scheduled events are checked, it goes on and on.
The only way to stop this appears to change the OS or turn the machine off.
My CPU usage is fluctuating even though I am not doing anything on my computer, it keeps on going from 3% to 18% constantly. The main thing that bugs me about this is, my Fan will start blowing really loud and then go quiet every 15 seconds when the CPU usage goes up. Any Ideas on what I can do to stop it? (I have a image from the task manager, but I dont know how to insert in this)