It was good to see IceKool's problem solved (separate thread) but I am in virtually the same situation and still I have no Norton toolbar.
I run XP SP3 on a 2 year old Dell Inspiron with dual core Centrino - have reinstalled both Firefox 3.6 and Norton IPS 2010 this morning (about the third time now for Norton) and both programs' update services now tell me that there are no later versions available. Restarted the computer. Guess what....no Norton Toolbar.
I have checked and searched Firefox add ons - there is nothing on the Firefox site that responds to a search for Norton.
All the Norton relevant configurations are set to "green".
This has been dragging on now for weeks.......what can be done, other than offloading Norton???????????