"Windows Explorer runs all those services you were missing."
Yes this is correct.
For some reason one time when you started your system Explorer must have crashed on loadup.
No this is not right the problem you have is with a program or a driver not Compatiblewith Windows 10.
When that happens it's supposed to automatically restart, but obviously didn't.
If it is a I.E. crash then yes this will happen.
As usual a reboot won't ever tell you what went wrong but it will fix it.
No Windows 10 will attempt remove the problem and then load drivers that will work correct. this takes time and will look like windows 10 has crashed but it has gone into a hold mode while it trys to right the problem.
Please note that the Windows 10 update process has been abnormally buggy and there's nothing you can do about it
Really how many times have you done this to make this statement ?. All the times I have completed this process I have had no problems. also all the post that help you with problems like this one are lost in this thread.