System infected: worm w32.vbna.b activity?!??!?

Norton Recently came across this...What exactly is it and how do I get rid of it...and what do I get it from??
Update: I'm new to Norton so I have no idea how to do that...It doesn't give me an option right off the bat to "delete it"
Update 2: It does say it blocked the intrusion and there are no reccomended actions other than stop notifying me...Anyway to make sure it stops trying to get in?
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