if you have a new legal copy, Norton provide a free help line service for problems when installing.
The numbers for all countries are listed in the documention with the CD.
As a matter of interest, where are you located? I am in Hammersmith, West London. Advise this, and if you like I can find the number for you.
I use Norton Internet Security 2006 (cannot go higher because o/s is W2000).
Have occasionally used the helpline when there has been an installation problem. Found the Norton support guys to be most helpful. They can remotely operate your pc to cure the problem, which sometimes takes a long time.
Please advise on progress.
Good Luck - Keep us posted.