Hello , sorry about your problems. My name is Marco and I will do my best to help you.
Go to MSCONFIG and activate all the processor cores.
To do this, follow these steps.
Press Windows+r keys and type: msconfig
Press Enter.
Switch to the Boot tab and click Advanced options.
Now check the box next to “Number of processors” and then select the highest number available from the drop-down menu below it. Click Ok when done.
Back in the System Configuration window, click Apply and OK.
Now restart your computer for the changes to take place by clicking Restart on the dialog box.
Go back and see if it solved the problem in the task manager.
If not, just uncheck what I made you check.