Even if I use only 1 or 2 apps the cpu is 100%in task manager

In the Task manager open the Details tab. Scoll down to find what process is running at a very high level. Right click on that process and if it is not a basic Windows function you can end task or set the priority to low. If you can find the process that is doing this (perhaps Runtime Broker) you can see if you can remove the function from the start up. If nothing helps then re-installing or Resetting Windows could fix the problem.

In Windows 10, open the settings menu (Start > gear icon) and go to Update & Security. You can Choose Troubleshoot or Recovery > Reset this PC and follow instructions.