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
If you wish to post a pic...
Find a place to host the pic online, then Look at this post telling how to format (including adding graphics) posts for Apple Discussions...
http://discussions.apple.com/thread.jspa?messageID=607563
To insert images into your post, use the <img>-tag. Note that the image you want to use in your post needs to be hosted online (e.g. on your .Mac website, etc.); you can not
upload images to Apple Discussions.
For example, <img src="http://web.me.com/bartspain/site
2009_apple/screenshots_files/startrec.jpg"> displays the file stored at your specified location.