ok last night my pc at home done a set of updates on 8.1
reboot and black screen with cursor
wtf, anyway manage to ctrl+alt+delete and get to task manager, hold down shift while on task selection, move down to power button on bottom right and restart into recovery/troubleshooting all done keeping shift pushed down.
selected advanced, system restore & all back up and running.
got to work today & 4 new Systems had done exactly the same. systems only 24 hours old.
feking M/S updates for windows 8.1 suck..