"remove norton and purchase another product"
Sounds like you may have another AV running while trying to install. Be sure to uninstall it totally before loading in a different one.
IMO, unless you run a small business or are a corporation I would say scrap Norton...just not a good Anti-virus...I would suggest Avast Free which has better real-time protection and free auto-updates and you don't have to do any scheduled scans. I have been using it for almost 10 yrs now....works great!
Some HELP in posting on Computing.net plus free progs and instructions Cheers