>There is no such tab when I open the property sheet of the dotnetnuke folder (or any other). How do I turn it on? I've been looking all over Windows help but have not been able to do it. Since this is a home netweork I share the C drive. Maybe if I didn't do that I would get the security tab?

PMFJI, but are you using simple file sharing? If you are, you should turn it off. To do so, open Windows Explorer and select Tools - Options from the menu. On the View tab, scroll down until the end where you will see Use simple file sharing (Recommended). Uncheck that box.