My iMac G5 keeps losing its WiFi Connection

I have 3 macs working off my wireless router. Two out of three are still working fine, but the third (an iMac G5) keeps losing its network connection and either won't find the network or, if it does, will not allow me to rejoin it, even after entering the relevant key/password. It has been in the same location in my house and has worked fine for the last five years. But oddly, if I move the G5 to within a few feet of the router it starts working again (though sometimes seems unable to find the network, although when it does it will let me join it, hassle free).
Have spoken to some Apple guys and, following their advice, have gone into SYSTEM PREFERENCES, NETWORK, LOCATION but having got that far a pop-up appears telling me that an application has changed my network settings. Zapping OK, this dialog box just keeps re-appearing and the only way I can get out of this corner is by 'force quit'.
Can you help?
Thanks
Dave

Because of a "feature" in the Security Update 2008-006 for OS X 10.4.11, sometimes 10.4 systems repeatedly display the message "Your network settings have been changed by another application." This message is sometimes accompanied by dropous in wireless connectivity. This issue went away with 10.5 or later.
The potential fix is as follows:
Delete the following files from Library/Preferences/SystemConfiguration
com.apple.airport.preferences.plist
NetworkInterfaces.plist
preferences.plist
com.apple.nat.plist
then restart. Before doing this and deleting these files, be sure to write down the names and passwords required to log in to your router as all these settings will be lost and will have to be re-entered.

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