Buttons/Menus for File Sharing missing

You installed "File-and-Sharing for Microsoft Networks", but you cannot share a drive or folder, the "Sharing" option is missing in the context menu:


Have a closer look to your Network applet in the Control-Panel:


Is the button for "File and Printer Sharing" missing ?

Did somebody use POLEDIT to disable File-Sharing on your system ?


You can also look in your Registry under the key:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Network:



If the key "NoFileSharing" is set to "1", that explains your problem.
Change the value to "0" and then restart (=reboot) your system.