Problem:

Unable to see hidden files and folders, when you select
“show hidden files and folders” in the folder option and
click OK, it will revert back to “Do not show hidden files and
folders”.

What to do?

This problem mostly caused by viruses. To troubleshoot
follow the below steps.

1. Take a backup of PC registry: Open Run window
   and type Regedit. Highlight My Computer, go to file menu and select Export and save the data.
2. Go to the following registry key:

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Explorer\Advanced\Folder
\Hidden\SHOWALL

3. Open the value CheckedValue in the right window and check its type and value, Its type should be REG_DWORD and change value data to 1 (0x00000001). Click OK and close the Registry editor.

4. Now check if you can view hidden folders and files, if still not possible then Delete CheckedValue in the right window and create a new DWORD value called CheckedValue by right click on the empty area and select New Dword Value. Modify the value data to 1 (0x00000001).