Yet Another Zeroaccess!inf Infection

Long time user of Norton Anti-Virus Corporate Edition.  Recently downloaded a 15 day trial of Norton Ant-virus at the site and installed. It has identified Zeroaccess!inf.  Coincidence that the Corporate edition could not find it but as soon as I download the trial version I get infected or is the new Norton Anti-Virus more sophisticated and found it where the Corporate Edition could not?  Anyway, Norton Eraser cannot remove so I need help getting rid of it.  MalWare Bytes does not find it nor does Sybot S&D.  I am also running Zone Alarm Firewall.  Computer is Windows XP Home Edition, Dell Dimension 4600.  I am an experienced computer user.  Any experts available to help?