Hello I found a Topic or Thread, I don't how you name them here, with the same problem I'm experimenting, here is the URL: http://community.norton.com/t5/Norton-360/Windows-Media-Player-11-media-sharing-ps3/td-p/248253
I was reading that thread but my problem gets solve when going to Manage Firewall > Then I turn Off the whole Smart Firewall. After That I am able to Share my Media that is stored in my computer to my PS3, but then it comes another problem, after turning off the Smart Firewall it leaves my computer Vulnerable and at Risk, so Norton 360 asks me to fix the problem then it turns the Smart Firewall again On then I get back to not be able to share my Media to my PS3.