Hello,
I want to add a WD box to my tv in the bedroom that needs a lan port
i want to add a wireless router upstairs in my bedroom. i can not wire it into the router in the office as I have no cable running to my bedroom the office has a wireless router running.
You could try an Ethernet over power device. Some people have great luck with these, and the speed is more then enough for streaming HD to the WD tv, some people don't have such great luck.
This is the first one that came up, but there are lots of options.