being spammed by Trojan.Gen.2 Trojan.Zeroaccess.B

I have Norton Internet security (the latest version) but am being spammed with notifications from norton saying "Trojan.Gen.2 and Trojan.Zeroaccess.B have been blocked" every 10 minutes or so.

 

My specs:

Windows 7 ultimate 32 bit

 

Yes I do have a flash drive