Sounds like you may have some additional problems.
Try the native System File Checker and see if that tells you anything.
Open an elevated command prompt and in the command prompt window type
sfc /scannow
hit enter
let it run and see what happens
You might want to try clean booting your system as described here
https://support.microsoft.com/en-us/kb/929135
Easily done, easily undone.
Basically you're just disabling all the Startup Items and All
non-Microsoft services.
Be sure to check the box to hide Microsoft Services, as you don't want to accidentally disable any of those.
Create a new user profile to determine if the problem is unique to your profile or global across all profiles.
Go to
C:\Windows\System32
Find
Cmd.exe (if you are hiding file extensions then it will only say "Cmd")
Right click it and choose run as administrator
At the admin command prompt type
net user JohnSmith /add
hit enter
then type
net localgroup administrators JohnSmith /add
hit enter
type
exit
hit enter
Restart and log in as JohnSmith
Failing the above you might want to try performing an in-place upgrade repair. That is to say...... upgrade it again, overtop of itself from within your current install, just double click setup.exe in the installation media. Just be sure to check the little box to get updates as part of the upgrade process.
That will generally keep all your programs, data, drivers and such safe, but.....
I would still create a disk image before going forward.
Installation media can be obtained here
https://www.microsoft.com/en-us/software-download/windows10
If you already have the ISO you can simply mount it from within Windows 10 and run setup.exe from there.
Neosmart has a pretty good article on it here
https://neosmart.net/wiki/windows-10-repair-installation/
You can skip the first couple paragraphs where they are promoting their recovery CDs and drill down to the meat of the article below.
