I installed Norton Internet Security 2011 a few weeks ago, upgrading my copy of NIS 2010. Everything worked fine up until about 10 days ago, when my Internet Explorer suddenly stopped responding while trying to launch. A little research revealed that the Symantec NCO BHO addon was the culprit, taking upwards of 3 minutes to load. I just tried it again tonight, and it had a load time of 271.02 seconds. I am running NIS version 18.1.0.37 and Internet Explorer 8.0.7600.16385. I haven't made any other significant changes to my computer other than regular Windows Update. Any suggestions? I rely on my Norton Toolbar to manage my passwords, so having to disable it has been a tad inconvenient.