That was clarified to be windows 8 can't host network tuners but can connect to them... I occasionally use them with my laptop that came with windows 8 (it still should be considered unsupported though... I'd even go to say network tuners in general is unsupported and if one wants them to get a prime) Every time I chose to add my laptop (remove one from win7 host to make it available to my win 8 laptop) I do have to run tuner setup a few times on each machine as the win 8 machine likes to steal all of them.... I'll do some more testing next week but I believe I originally thought that every time it would boot it would try to steal them but was good as long as it was up... but I do know it lasted a couple of reboots one weekend. I believe what worked for me was assigning the win8 tuner first then pick up the other 3 in win7. I also believed that both might have some remnant of which tuner is live tv and always try to use that as my main machine always prefers tuner 3 for live tv and my laptop did the same the first time running through tuner setup and it wasn't until a completely removed and reinstalled the drivers (I can't remember but I think the win 7 drivers worked better than the win 8 drivers on the laptop)
Next week I'll have some time to test some various setups (including testing intel HD video again with protected h.264 content) as I got a new SSD thats begging for an OS to be on it..