Great tutorial Orbital Shark, I wanted to update you on one thing, you don't need to enter safe mode to do this in between reboots.
Let the computer reboot, once it says "completing installation..." with the infinite loop going on, then Press SHIFT+F10 and type in "compmgmtlauncher" as orbital shark has explained. You can start disabling items on the fly until you see progress with the install. Just go down the list, anything with a yellow ? just disable, my issue was a co-processor driver
, about the 10th thing. Once that was gone it finished the install a minute.
Hope that helps some of you.