Sometimes the restriction which takes place in the registry won’t let you access the Folder Options or the changes would just disappear upon closing the dialog box.
See the post Show Hidden Files and Folders
Try the below steps if the "Folder Options" in "Tools" menu is not visible or it grayed out.
1. Open the Registry Editor (Go to Start - Run and type regedit and click on OK)
2. Then navigate to :
HKEY_CURRENT_USER\Software\Microsoft\Windows\Current Version\Policies\Explorer
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\Current Version\Policies\Explorer
3. Delete the DWORD value named NoFolderOptions from the right-side pane
4. Restart the computer
If you are not able to save the changes which you made in show hidden files, try the below steps
1. Open the Registry Editor (Go to Start - Run and type regedit and click on OK)
2. Then navigate to :
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
Folder\Hidden\SHOWALL
3. Change the DWORD value named CheckedValue to 1
4. Restart the computer