Open Command Prompt as Administrator, then run this command and press Enter:
powercfg -h off
When that command completes, restart (not shut down) your PC
Hello again,
Thank you for your help...
The problem was adjustments through power settings
I should check for sleep system every option ( minutes and hours ) except from the ''never'' option!!!
Furthermore I changed a parameter of the Winlogon from 1 to 0 ( regedit ) but for this change I did it before the power settings so I left it as it is
I don't want to change it to 1 value again ... Now my PC shuts down to every click on the Power Off button is excecuted