Network Preferences Madness

Hello,
Whenever I go to “Network” in “System Preferences,” a window appears telling me the status of Built-in ethernet and Airport, followed immediately by an overlay window saying, “Your network settings have been changed by another application,” with an accompanying “OK” button. If I click the “OK” button, the window disappears, but then immediately reappears, over and over again. I can not get it to go away nor can I quit “System Preferences” unless I use “Force Quit.”
If I log out and log in again as a new account, all is well with “Network.” No problems.
I am using an Intel iMac with OS 10.4.11. The problem is constant whether or not I am connected to my cable modem or router.
What could be causing this problem? Malware?
How can I correct it? I fear that if I trash a network preferences file I will never get back on line.
Thank you for your help.

Hello zyven12, and a warm welcome to the forums!
It was one of the last two Security Updates.
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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