Live debugging a VM in Hyper-V: http://mikemstech.blogspot.com/2012/01/live-debugging-hyper-v-virtual-machine.html
Troubleshooting 0xc0000135: http://mikemstech.blogspot.com/2012/01/troubleshooting-0xc0000135.html
Make sure you are properly loading symbols in your WinDBG workspace or you won't get enough detailed information to proceed.