I recently went into Change Date & Time Internet time tab and chose a time standard to connect with. After doing that I went onto the internet and connected with time.nist.gov and checked the time. After that I was no longer able to go into the internet time tab. It tells me that time.nist.gov is the time connection and I can't change it. It tells me I need to have permission to do this as administrator. I am the administrator! What goes here? Can anyone help?