Even if you did get a key from someone else, I'd be very surprised if it worked on your system. To start using Norton 2004 your PC connects to Norton's servers and the key is verified. If I was to give you a key and you were to use it, it'd be registered as already in use. You'll just have to buy a genuine copy of the software or use a different product.
i may be wrong(and apologise if i am) but my guess is that youve dl'ed it but have no key !
u can also dl norton keygens but as previous poster said - this will need verifying by norton and will probably not work !