What to do if your computer is stuck updating
Depending on what is being done to the system this could take a few hours.It’s not the normal amount of time, granted, but it does happen.There is a way to get around this particular feature though, which you’ll find in our How to Stop Windows 10 updates guide.But if you find your PC sitting at a certain percentage value indefinitely, then Windows Update is probably stuck in a loop.We felt sorry to post this tutorial too late after most of you have encountered this biggest headache that Windows 10 update gets stuck on 'Restarting' screen.We've noticed that restarting stuck problem happens every now and then when users try to upgrade Windows 10 from Windows 7 & Windows 8, or just do a regular Windows 10 update (i.e. - "I recently downloaded my Windows 10 upgrade which I had reserved, everything went smoothly but when I click the 'upgrade now button' in the dialog prompt which says schedule it or go for it now, the computer goes into restart screen and stays there forever." - "After I successfully upgraded from Windows 10 v1511 to v1607, during which no error messages, no incompatible devices...
Actually, In this case, I don’t think you are lucky enough to downgrade Windows 10 to Windows 8.1/8/7 or an earlier system restore point even after a few hours or days.
Here's a quick way to interrupt this cycle and get the update process back on track.