Netscape 6 And Win2K Web Viewing Problems?

freedom_surfer asks: "I recently set up a Windows 2000 network in a lab at my school. To make a long story short, my users and I are having problems accessing certain pages with Netscape 6 while logged in as a regular user. You can't access abcnews.com, you can't check your e-mail at Hotmail, and there are other numerous pages abroad and here at school that don't seem to function properly under Netscape 6. Explorer on the other hand works fine on these pages. Now I suspect that it has to do with Win 2K security, but how eludes me. Any more information on this subject would be most helpful."