If you move to a new machine, you lose your NAV subscription. The only way I know to move it with the machine is based on the following. I've not verified it yet.
First uninstall NAV/NORTON PRODUCT and then delete this file: 'Catalog.LiveSubscribe' It can be found in one of the folders below.
For Win 9x/Me go to this folder:
C:\WINDOWS\All Users\Application Data\Symantec\LiveSubscribe
For Win Xp/2k users, go to this folder:
C:\Documents and Settings\All Users\Application Data\Symantec\LiveSubscribe
Now re-boot and re-install your NORTON PRODUCT, that's it... your LiveUpdate subscription is back up and running for another year!'"