This router is one I've used and if a Windows 2000 machine worked then we use a XP machine and there are issues, it's not the router.

Please ask a new question in our Computer Help forum about why some pages won't work. Be sure to be complete in your post about the OS, the Norton version, Spybot, Teatimer, Adaware, and all the protections as well as your tests with firefox, opera and IE 8.
Bob