Need help with Trojan.Zeroaccess, Trojan.Gen, Trojan.Zeroaccess.2, Trojan.Gen.2

I have an Intel PC running Windows 7 Home Premium and using Norton Internet Security 19.7.1.5.  I recently started getting Norton pop-ups alerting me that these viruses are being found and blocked.  Recently got the Norton 5013, 3 error and followed the steps to run NP.EXE and I no longer get that error, but I'm still having problems with these viruses.  I have a flash drive and can follow directions.  Please help.