Taz,
I realize that you've already solved the problem, but just in case you find yourself changing where stuff is in your house, they do make wireless "dongles" that connect via RJ-45 connectors rather than USB.
You'll want to look up things like "wireless gaming adapter" since they are designed specifically for that purpose: You have a wireless router but your gaming system, which can connect to the internet, doesn't have a wireless transmitter in it. You'll set up the gaming adapter on your computer in order to give it the SSID, any encryption keys needed, etc., and then you just plug it into your game console/DVR/whatever that has the RJ-45 connector.
I had a similar issue: My ReplayTV has a network interface and can get the channel guide over the internet, but it only has an RJ-45 connector. The wireless router is nowhere near it, so I used a wireless gaming adapter (mine was a Linksys WGA54G) to have it wirelessly connect to the internet.
Rrhain
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