 What to do if the CPU in your computer is at 100% usage all the time, opening the Task Manager to see if there is a process putting a lot of pressure on the CPU. Now, switch to the tab Processes that lists all processes and services running at the moment. Right-click on the application consuming the CPU's resources and select End Task from the list. If you don't see any processes in the Task Manager that could give your CPU a hard time, but it's still 100% loaded, try using Process Explorer. This utility can show you absolutely every process in your PC. System idle process shows how much system resources are free. Interrupt shows how often the system interruptions occur. One of the key conditions for any computer to work properly is the temperature.