192.168.x.x

Well, at least it is finding a DHCP server then.

I know you said that you had tried turning the DHCP server on the router off...

...but I think the most likely cause of problems at this moment is that the Receiver is finding the router's DHCP server rather than the one in the ARM software. If the Receiver gets it's DHCP lease from the router it won't have the data it needs to then find the ARM software on the PC (the DHCP response that the ARM software sends tells it where to find it's firmware image to boot from).
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Remind me to change my signature to something more interesting someday