System Preferences-Network-Can't access

When I open Network I get a warning message "Nework setings have been changed by another appplication"
I cannot close the notice and therefore cannot read or change the settings. I usually keep the page locked, but notice it is unlocked.
I don"t know how long it has been like this.
Help!
Anthony342

Hi Anthony342, and a warm welcome to the forums!
To stop the pop-up, Go to System Preferences: Security. Check the box next to "Require password to unlock each secure system preference." Then lock Security.
Try this cure for Security update...
http://discussions.apple.com/thread.jspa?threadID=1730909&tstart=0
The locations are actually...
/Library/Preferences/SystemConfiguration/preferences.plist
/Library/Preferences/SystemConfiguration/com.apple.airport.preferences.plist
/Library/Preferences/SystemConfiguration/NetworkInterfaces.plist
/Library/Preferences/SystemConfiguration/com.apple.nat.plist

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System Preferences-Network-Can't access

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