Trojan.Brisv.A!inf Removal Tool

Hi, I'm a real newbie to this but wondering if anyone can help & I have search but not found a thread that may already have the answer so will apologize in advance if the answer is already there.

 

I have NAV 2009 & it has run telling me that I have Trojan.Brisv.A!inf - high risk threat.  I have downloaded the removal tool, run it & it has told me that it couldn't find it.  I have run a full scan again which is telling me that it is still there.

 

Any help would be great.

 

Thanks :smileyhappy: