Windows 7 shutdown bug prevents users from turning off their computer Some users have been reporting that they are receiving a popup window "You don't have permission to shut down this computer" every time they try shutting down or rebooting their PC.
The easiest workaround is to use your keyboard and press: Ctrl+Alt+Delete keys which brings up the “Task Manager” screen. Look in the lower right corner and you will see a Red colored “Shutdown button”. Click on the button.
Note: be sure to close out all your open applications before attempting to shutdown.
More grief: Just days after the Black Screen issue was resolved and slightly more than 3 weeks after Windows 7’s End Of Support Microsoft has yet another issue to solve and hopefully release to Windows Update.
At this time I have not been able to reproduce the shutdown problem on any of my 3 computers.