I am having what appears to be the exact same problem. When you click on "Turn on Media streaming" from inside the libraries tab after clicking "Stream". It does not allow me to click on ok to turn on the media streaming. I used to find it very easy to set up media streaming previously in XP and Vista, but this is proving difficult. the following screen shot is what I get. Also it appears I am not able to select any "show devices on." Which I imagine is the problem, but with no proper guidance from within windows 7 I am at a loss what to do. help would be greatly appreciated.