Find this key in your registry:
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden]
Modify the string value "Type" and enter "group" as value data.
After the edit is complete hit F5 to refresh, and go look in your Folder Options.
If the problem still remains then change the registry value as given below
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL]
"CheckedValue"=dword:00000000