Help with password manager

I am recently having trouble invoking Norton password manager as a part of NIS 2010.  It has been working fine up until today, but suddenly it doesn't want to load.  I have tried going through IE.....tools ......manage add-ons.......but it isn't even listed as an option.  Does that mean that somehow it has un-installed itself, or is there another way to get it to start working again. Any help would be appreciated.  The version of IE is 8.0 64-bit, if that matters.  And the OS is Win7 Home Premium.