After a virus attack in one of my client machines, the folder options from the windows explorer was missing and we were unable to show all the files including the hidden ones. So here’s what I did to restore it back:

Go to Run –>gpedit.msc
User Configuration –> Administrative Templates –> Windows Components –> Windows Explorer
Enable and then Disable “Removes Folder Options menu from Tools menu”
Close all windows explorer windows and then open again.. most probably your folder options is back