Using these drivers, the black screen on wake problem in Windows 8.1 seems to have resolved itself, but I still have the HDMI audio not coming back when my A/V Receiver is powered off for some time.
It appears it is this issue being discussed here:
https://communities.intel.com/thread/41853?start=45&tstart=0
I have made sure both the graphics AND the audio driver get installed by using the Intel installer, and then verifying with device manager afterwards.
System: D53427RKE NUC
Windows 8.1 w/ Media Center x64
RAM: 8GB
Intel HD Graphics 4000