I created another user account, tried to log into it, kept getting an error "Access denied, can't log on to System Event Notification Service service".
I signed back in to my admin account, went to control panel/admin tools/services and checked to see what my setting was on the System Event Notification Service. It was selected as started. I stopped it, set it to manual and again tried to access the other user account, I got the same response.
I'm really desperate to set up another account on my computer as I need to control what my kids do, block certain sites as well as other reasons. They are currently using my admin access which obviously gives them access to EVERYTHING.