nis 2011 cd

Hi to all. I'm new to the forums and would like ask some questions about nis 2011 cd that I just purchased.Should I download the lastest release of 2011 from a link  from norton or just run the cd.Also how do you stop nis 2012 from downloading from live update,because I think I will pass on upgrading till norton straightens  out nis 2012.Never had norton on my machine before hope    I made the right decision.Now I have to uninstall mcafee internet security which came with the machine.Wish me luck and thanks for any help given.  dktbill