Trojan.ByteVerify and Trojan.gen

I have an Acer laptop with Vista and I am running Norton Internet Security (2011).

 

One week ago, a routine scan found and removed a Trojan.ByteVerify.  Today, another routine scan found and removed another Trojan.ByteVerify and a Trojan.Gen.

 

Is this the same thing that hasn't really been removed....or am I dealing with separate viruses?

 

Please advise.  Thanks!!!