Hi I have no idea where you are. Your thread says you can not shut down your computer?? How are you trying to shut down your computer??:wink: What make and model? What are you trying to do in system devices?
Pull the power plug.:wink:
Start your computer and follow the POST, when Windows should begin loading, press the power button to shutdown your computer.
Repeat the previous step twice, and in the third restart the operating system should enter into the Windows Recovery Environment (Windows RE), where a number of diagnostics will be performed to try fix any booting issues, but you will also get an option to access the Windows Startup Settings.