Windows 8.1: black screen with cursor

[Hardcase1]

Over the weekend I experienced problems with my Windows 8.1 after trying to access hidden files and changing security settings for administrator. First all files disappeared then after system restores I found I could only get to a black screen with cursor and error message: Microsoft Visual C++ Runtime Error!; Explorer.exe. The application has requested the Runtime to terminate it in an unusual way.
I have tried various fixes:

• clean boot i.e. few services running
• Safe mode
• uninstalled Nvidia graphics driver
• sfc and checkdisk before booting
• uninstalled Windows updates
• uninstalled all Microsoft Visual C++ updates (5 or 6) then reinstalled Microsoft Visual C++ 2015 x64
• I am currently trying a chkdsk C: /f /r /x command which may do the trick!​

Can anybody suggest anything else?
Thanks in advance.

 

[davexnet]

There is this tool that you can try; you can select the individual fixes to run. One of them is
to reset to default security permissions.
Tweaking.com - Windows Repair Free/Pro
Best way (and safest in my opinion) to view hidden files is to boot a Live Linux dvd and then use their
tools to view the windows partition.