I’m not exactly sure how I managed this, perhaps because a cancelled a restart, but I ended up with Windows 8 showing me a blank light blue screen. I had a mouse but that’s it. No text, no chasing dots around a circle, nada. After watching it for while, after-all interrupting an ‘update & restart’ is not something I do lightly, I decided action was needed. So here’s the advice. CTRL+ALT+DEL->Task Manager->New Task->”Explorer”. The desktop sprang to life and I was able to re-ask for ‘update and restart’ which it duly did.