Working on a Citrix upgrade project a few years ago I was continually getting a blue screen when a Citrix PVS image booted. The symptom was obvious during the boot process. It was as if there were two NICs or the image was trying to load twice. PVS write-cache was also incorrectly being redirected to the server.
I checked and rechecked all the obvious suspects, such as ghosted NICs and other devices, old DHCP information, antivirus, etc. Everything looked good. It really did not make a lot of sense. I then stripped all the apps and tools out of the build and it worked! So what was I doing wrong?