Trojan.gen, and trojan.zeroaccess infection - Norton Auto-Protect appears every 5 minutes too.

Hi, Norton

Auto-Protect keeps popping up every 2-5 minutes and saying "Norton Auto-Protect protected you from risks"

 
It keeps blocking: Trojan.zeroaccess.c, and trojan.zeroaccess.b and trojan.gen and trojan.gen.2 

How to delete these trojans?