Windows

screenshot of autoruns.exe

In case your computer (wit Microsoft Windows) runs with high processor load without having software started, you could try

to find out which process uses up the available processing power. This program is part of the Windows Sysinternals. There are other useful programs like

which can tell you, which programs or services are automatically started when Windows starts up. Sometimes, you can find programs that you did not expect or did not want to start.