CPU cores manually change
- Type in the search bar of the start menu the command "msconfig".
- In the "Start" tab click on "Advanced options".
- Here you can select your number of processors manually. Then save your settings with a click on "OK" and "Apply".
- From now on, you start Windows 7 computer with the configured number of processors.

Number of processors select
If your PC is no longer working correctly, you can get all the settings in safe mode to undo.
