WIN 7 dmz pc, can not be seen or see wdtv live

I have a win 7 ultimatepc , on a dmz  with the rest of my network behind the firewall. For some reason the wd tv live does not see my pc, how ever my hacked xbox with xbmc sees and connects to it fine… any ideas?

i have an att Uverse 2wire router, i used to be able to see my shares a few reformats ago, but i have placed the wd tv live on the same subnet as my dmz pc, have sharing enabled. and since i use orblive for my iphone, thats the only media server that shows. and i dont like the streaming video option. i like having the option of copying my files via the file management to my harddrive.