This problem is really frustrating. I have been using media centre without problems and all of a sudden I cannot connect my Xbox 360 to the PC. The PC can see the xbox OK, but the XBOX refuses to find the PC. I cannot run media centre or any sharing app in xbox. I have looked at loads of forums and this is a really common problem. trouble is they all give different solutions and I have tried all of them. Firewalls are all OK, all the right ports are open, sharing is setup OK etc etc . The only thing I have changed over the last couple of months is the workgroup name. But I changed it back again when I noticed the problem, and this has not sorted it out either.