Still more Trojan.Gen, .Gen.2, etc

I get these messages from NIS saying that Auto Protect could not handle Trojan.Zeroaccess.B, or Trojan.Gen, or Trojan.Gen.2

 

Trojan.Zeroaccess.B is in my Unresolved Security Risks, the others are in Recent History as Blocked.

 

Symantec recommended I seek help with the required manual removal of .Zeroaccess so I downloaded the Fix Zero Access tool from Symantec. I run it and it tells me that no infections were found.

 

Browsing here I see several people with the same problem. But as instructed, I'm seeking a personalized solution.

 

I'm running Windows XP Professional

Version 2002

Service Pack 3

 

And I'm pretty sure I'm 32 bit.

 

Thanks for your help and patience. I know just enough about computers to be dangerous to myself.

 

RELATED: Any ideas where I (or my wife) might have picked these fun things up?