I need some help with this common problem.
I have Windows XP SP2 and WMP 11. The 360 shows up in my media sharing, but the the PC does not show up on my 360. When ever I run a test it says PC Selected Failed.
Now, what I'm thinking is that I might need to open up some firewall ports, right? Except I don't know how to open them up on the Norton Software that comes with AT&T internet.

Am I supposed to be modifying WMP or WMP configuration? And then what?

Help, please. :( I'll be your bff <3xcore

EDIT

Let me just add that I've gotten this to work before, but I think I was using the Windows Firewall back then.

Allright, well I got it to work.
For any one who is interested or ever has this problem you could try downloading TVersity. Somehow it made the xbox recognize my PC and TVersity, so all is good for now.