Wednesday, May 13, 2015 – It seems that an automatic update sent down by Microsoft is causing some issues this morning. Many (but not all) computers are “stuck” at a “Updating Stage 3 of 3 Preparing to configure Windows Do not turn off your computer” screen at the end of a Windows update. We are seeing that this can easily be resolved by going ahead and hitting Ctrl-Alt-Delete and logging in normally.
Note: Windows 8 has a slightly different message that says “Keep your PC on until this done”, but the same solution applies.