Network preferences unusable

Hello,
I'm using a Macbook Pro running OS 10.4.
Earlier today I had to change some of my network settings (namely the proxy) in order to access a wireless network. My Macbook is now connected to my home network, but when trying to view the network settings is now pretty much impossible as I constantly get a message telling me that my network settings have been changed by another application. When I press ok, the message reappears. I have to quickly cmd-q to escape the messages and quit the preferences.
Because of this, my network preferences are pretty much unusable. I have tried rebooting my computer, but with no luck.
Is there any way to get around this problem?
Regards

"Your network settings have been changed by another application":
[Link to Topic|http://discussions.apple.com/thread.jspa?messageID=8340541&#8340541]
[Link to another Topic|http://discussions.apple.com/thread.jspa?messageID=8292814&#8292814]
['Your network settings have been changed by another app' - THE SOLUTION|http://discussions.apple.com/thread.jspa?threadID=1730909&tstart=0] - well, maybe a solution.
[Stopping the pop-up|http://discussions.apple.com/message.jspa?messageID=8558637#8558637]
[Pop-up - Your network settings have been changed by another application|http://discussions.apple.com/thread.jspa?messageID=8309498#8309498]
[Post by BDaqua|http://discussions.apple.com/message.jspa?messageID=8706457#8706457]

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Network preferences unusable

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