I would suggest that you get rid of norton Antivirus and anything else you have, unless if it's AVG, and then download and install the Avast antivirus program.(And maybe AVG also. Not sure if Mcafee works with Avast though if you want Mcafee Antivirus.) After that, I doubt you'll have any problems with viruses ever again... However, as a warning, Avast is very lethal agaisnt intruding programs on your computer, such as other antivirus programs, spyware, and such, so be warned that Avast may treat those programs as viruses, which can cause soem problems with your computer in that case. Also, however, Avast, IMO is the best antivirus program out there, and I think it's worth it over every other antivirus/spyware program.
Please feed the trolls. XD