Zbotmem-A not found by Norton

Hi all

 

I am certainly new at this. Sophos tells me that it found a Zbotmem-A trojan and put it in "quarantine" but it is in memory so it can not clean it up. I run Norton 360 on my computer and it didn't find anything.

 

Is the trojan still in my computer. I just run a scan using Norton a found nothing but 8 cookies.

 

Should I be concerned?