Firefox 4 hotfix - “Norton Toolbar is incompatible with Firefox 4.0. Norton Toolbar 5.5 disabled”

I followed instructions to apply the NIS hotfix, rebooted, and then updated FF to 4.0.  The Norton Toolbar is gone and FF gives me this msg: “Norton Toolbar is incompatible with Firefox 4.0.  Norton Toolbar 5.5 disabled”.   What did I do wrong?