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never use norton. it blocks steam so I can't play games anymore ;(
Never use that junk to begin with

And if you have it... uninstall asap. It's acting much like a virus itself, being annoying to the system.
My dad had Norton 360 and it failed to clean a zip file in the "my downloads" folder that I with ease got rid of by just pressing delete.
A free one should be good enough, I recommend Comodo Internet Security or Avast free.
And if you want something paid, go with Kaspersky or Eset Nod32.
I've got the latter myself (Eset) on my desktop together with Comodo free firewall (best firewall eva). On my laptop I've got Comodo Internet Security (free version)