Unable to install Norton Antivirus on new computer

I have built a new PC and have been trying to get NAV installed on it. When I put the install CD in, after about a minute a box appears offering to UNinstall the program but not install it. I have tried different install disks and even downloaded a copy it does the same thing. System is Windows 7 Professional on an Asus MB, Intel core I5 processor, 16Gb ram. 

Thanks.

P.S. I'm new here so be nice