I decided to cancel the update when it wouldn't let me continue to my local account without signing in to my Windows account. Huge mistake. Even though it appeared to exit cleanly and said it was restoring my installation, it completely borked my hard drive. It went into a reboot loop. I tried to restore the image I was smart enough to create prior to the update... Oh goody, my hard drive had disappeared and not even the Windows install setup could see it. I had to enter the BIOS and delete my raid partition. At least after that I could reinstall the image from last night. What a pain. An entire night wasted. I'll take a pass for now...