DCHP Problems and missing alf.plist file?

Hey everyone,
I have been having the DCHP issues/self-assigned IP problems that have been documented a lot on here. I was able to connect fine to my units router until 2 weeks ago and upon trying LAN this morning and my own airport express plugged in, I have discovered that both LAN and Airport are suffereing from lack of DCHP address and as a result no internet.
I was trying to delete the com.apple.alf.plist file but I don't have one? Even terminal can't find it. Does anyone have any suggestions? Is this the cause of my probable issue?? I can't log into the router because it isn't mine and what frustrates me more is that I can't get online to update Leopard.....

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