Can you start in Safe Mode? If so perform those.
If not I would do a Clean Install since it seems there is a lot of damage to the OS.
Boot to Advanced Startup Options in Windows 10 <-- use Options 6 OR Option 5 to get to Safe Mode
https://www.tenforums.com/tutorials/2294-boot-a...
From the Advanced Options - Troubleshoot - Advanced Startup Options - Startup Settings.
How to Start Windows 10 in Safe Mode <- see Option 1
https://www.tenforums.com/tutorials/2304-boot-i...
====
If needed :
A Clean Install would be activated with the Digital Entitlement.
How to Prepare Bootable Install Media for Windows 10 - DVD, USB or SD Card
https://answers.microsoft.com/en-us/windows/for...
Start fresh with a clean installation of Windows 10
https://www.microsoft.com/en-us/software-downlo...
Clean Install Windows 10
http://answers.microsoft.com/en-us/windows/wiki...
Hope that helps.