Computer shows in Homegroup, but not in Windows Media Player

Hey everyone. New to the forum. Thanks in advance for your help.

I've been racking my brain on this one for hours. Hope you can steer me in the right direction.

I have two Dell laptops, both running Windows 7. I have both set up on a HomeGroup and have enabled media sharing on both as well. Network discovery is turned on for both, file and printer sharing is on, password protected sharing is off. Under WMP, I have Media Streaming on. None of my folders are hidden.

For this discussion, things with Laptop A are fine, but Laptop B is causing me some problems. I have two main issues and fear they may be related: 1. From Laptop B, I can see Laptop A in the homegroup and I can see it in WMP. I can access all of Laptop A's files and play them back with no problem. However, from Laptop A, I can see Laptop B in the Homegroup, but I can not see it in WMP. I can navigate to certain folders in explorer and see the files, but I can not play them, even though I have all sharing functions that I can think of turned on. (I do have McAfee running, but disabled the firewall in case that was the problem. It didn't help)

Also, I have a DLNA compliant device on the network that I can stream music to using the "play to" feature in WMP. From Laptop A I can play to the network speaker just fine. I can not from Laptop B. I should add that I can "see" the device in WMP from Laptop B, but when I queue a track to play, it just hangs up as if it can't communicate any further with the networked speaker.

Hope that is enough info to get us started. Please help! And thanks in advance.

CD

Maybe we can water this down a little. I just added another DLNA device and it shows up on both machines, while the problem laptop remains invisible. I know have all my "sharing" ducks in a row, but it doesn't appear to be sharing anything. Any ideas, folks? I'm desperate!