Let me tell you something. ORB SUCKS!!
I have tried it multiple times and I have never gotten anything to play through my Wii. The stupid Orb server thinks your Wii is a phone, so it doesn't do crap.
There are probably other file sharing programs like Orb, but I gave up on them. See what you can find.
Try TVersity, it didn't run on my PC but yours is probably better.