OK Party, for starters... DON'T PANIC !!!
Sounds like you have a Trojan or active -X trying to sell you something.
You really do need to get rid of Norton's as it is the closest thing to a Trojan without being a Trojan that there is. To top it off they charge you money every year to use it. It is not an easy thing to remove either. In fact Nortons is a ************ to remove completely. Trojan and Active-X developers write programs specifically to get past Norton's [weak] defenses!
To remove Norton's go to:
http://www.bleepingcomputer.com/forums/topic42247.html and follow instructions.
Before you remove Norton's download to your desktop [totally free forever] Comodo Firewall from:
http://www.personalfirewall.comodo.com/ Now remove Nortons [disconnect from internet first] Make sure you do not install Comodo until you remove Norton's.
It's the firewall I now use and the only firewall in the world that passes all know leak tests. Its a bit technical as it goes into learning mode initially so it will ask for OK a lot when various programs are in use. Just keep clicking approve or OK a lot until it settles down. Just run it on recommend settings, not custom.
Also Download Comodo anti virus, it is also lifetime free and will scan your mail too:
http://antivirus.comodo.com/ . Failing that I'd recommend Bit Defender anti-virus [goggle it] free edition.
Now all you need is Spyware Blaster [stops the rubbish before it gets on to your PC] at:
http://www.javacoolsoftware.com/spywareblaster.html and Ad Aware SE at:
http://www.javacoolsoftware.com/spywareblaster.html and the GENUINE Spybot search and destroy from :
http://www.spybot.info/en/index.html When loading this program do not tick [enable] 'tea timer'.
Make sure you update the above lot and run Spybot and the Ad-Aware which should take care of the rubbish annoying you. Then run the anti-virus.
See how you go.