1607 is a major update, similar to the Service packs microsoft used to put out in the old windows xp, vista and windows 7 days.
You may luck out and only need to do a system restore, which wont erase your programs and files.. So lets try this.
we need to do this special trick to force a repair screen.
Start the computer, then immediately press and hold power to shut it down.
repeat that 4 times, and then the last time when you start the computer do not press and hold power.
It should go to a blue screen menu.
If you get to the blue screen menu, continue. Other wise, keep trying the forced shut down approach above until you see the blue screen that says diagnosing your computer , or shows buttons such as continue or troubleshoot.
Once we see the troubleshoot button, click it, then click advanced, and then click system restore.
Then, system restore your computer to a date before the problem began.
Let me know if you can make it this far, or not. And if you cant make it that far we may want to consider rolling back to a previous version of windows 10.
So win lose or draw keep me posted!
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Senior Technician and Network Switching Systems Operator / Maintainer.