need help with removing a hacking prgram

I went away for a few days and when I came back Nortons scanned my computer and it picked something up.  This is the error msg I got when I clicked on it.

 

Infected file: g:\stuff from other comp\stuff\norton 2005 - systemworks + internet security + ghost 9.0 + goback + all keygens\norton ghost 9.0 (2005)\key-generator ng 9.0\ssg-ng90.exe
Manual removal required

 

 

what exactly does this mean and how can I get rid of it?