Xbox360-PC Not Listed!!!! Help!!!!

I have been trying to get my PC and my Xbox360 to share media but i can't get it to work. Does anybody have any tips or ideas on how i can fix this. I have Windows Vista by the way. I also can't get my Windows Media Center and Xbox360 to connect to each other either. Any tips would be appreciated.

I have tried so many things! I have googled the hell out of this already, but no luck. The next step is calling up customer support and having them help me step by step. Knowing my luck it will be something really simple. Just wondering if anyone had the same problem and what they did to fix it?

I had a lot of trouble with this myself and spent a long time on the problem. Make sure to bring down your windows firewall if you are trying to connect to the Xbox and also make sure that you have allowed the option to share files through windows media player to your Xbox, you can also use Zune player to share files, you just need to make sure that you specify in the options for WMP or Zune the specific file you are trying to access from the 360. Once you do that the system should be able to connect and read the files you are trying to play

I've found that the Zune player is way better at streaming stuff to my 360 than Windows Media Player.