Also having same problem
I am also having this same problem with network booting to an image server in one of our office locations. This happens with same version as above, 8.0.18101. It does not matter what Mac we install Parallels 8 and try to boot a VM on. It has this problem. Parallels 7 works fine when booting to the same server at this location. In our 2 other offices where there are identical imaging servers, Parallels 8 can boot to it and install Windows 7 with absolutely no trouble whatsoever.
For the problematic server, we have tried both a pre-made blank image (that I created), as well as starting from scratch. One of two things will happen consistently. The first is that we will get a Windows startup screen that never advances to the PXE environment. We have let it sit there for 40+ minutes to no avail. The second is the BSOD, with the same information provided by sjsherratt.
Any help would be greatly appreciated! I have screenshots of each but for some reason am unable to attach them. I can email if needed.