No matter what I did I could not get the Hyper-V guest shutdown service to start on a Windows 2003 R2 Hyper-V guest running on a Windows 2012R2 cluster. The integration components were up to date and all of the devices were present in the guest's Device manager. I didn't want to force an uninstall of the Integration components if that is even possible so I kept digging.
To get it working I had to add edit the registry HKEY_Local_Machine\software\Microsoft\Windows NT\Current Version\SvcHost locate the ICService key and edit it adding vmicguestinterface. If it is already there you may have a different problem. After adding it I removed the Microsoft Hyper-V Guest Shutdown device from the server and rebooted. After the reboot it was re-detected and installed and the service was able to be started again!!!
Needless to say, MY BRAIN HERTZ
