For some strange reason I did not get an email telling me you had replied.
I figured out the iTunest file that Windows Media Player uses on the 3rd computer was corrupt and Apple helped me fix it.
Unfortunately now computer 1 has dissapeared from Home Media Device list.
Computers 2 and 3 have the WMP icon and work ok. I went to all 3 computers WMP and they all work.
I know Sharing is working and verified it by going to Network\Network and Sharing Center shows all 3 computers, the Dish Hoppers and Dish Joeys and the router are all listed.
Computer 1 is Win 7 64 Bit desktop, computer 2 is a Win 7 32 bit laptop and computer 3 is a Win 7 32 Bit Desktop. I don't know how to determine what version of WMP they have but it came on the Windows 7 Home Premium Discs install around Nov 2012.
I really appreciate your help getting computer 3 on the Device List.