Thank you for contacting us here on the answer forum. I am sorry to hear that you are having a problem with Windows 8 but it should be working for you. What is happening exactly that is not allowing you to view? The last thing I need to ask is are you trying to watch from tile mode or desktop mode?The computer has to be in desktop mode to let the slingbox work correctly. I have an article that I will post that show you what operating systems are now supported.
Hope this helps,
Sling Moderation Team