I have a feeling that you have a virus, malware or adware or something like that, but i could be wrong. I would honestly first try re-installing windows or whatever operating system you are using. With a clean install, or with a freshly done factory reset or system restore, check to see if your cpu usage is spiking still with no noticable culprits. If not then i would say problem solved. If so, maybe look into some extra cooling for the laptop. When the laptops cpu is running hot, sometimes it will throttle the performance, making the cpu have to work harder to achieve the same results. Hope this helps!