I own a Asus Mainboard (KGPE-D16) with 2 onboard Intel 82547 nics. I install the Window Server"8" beta Hyper-v in this machine. After the install i receive an error message that there are no NIC's available. This is also the case in Windows server 2008 R2 HyperV.
With HyperV 2008 R2 i could download the Intel Pro Set drivers version: 16.8.1, and it worked fine!
I also tried this with Windows Server "8" beta Hyper-v but with no luck. I first posted an message on the microsoft forum but they advise me to contact the vendor or manufacturer.