Uninstalled NIS 2009 and did fresh install of 2010 and it causes firefox to encounter an error and close whenever I want to download video eg with “you flv downloader” (Moyea). Deinstalled 2010, everything works, re-installed it, same problem, with or without toolbar installed. Using Microsoft Security Essentials now and everything works. Also tried to reinstall firefox several times as well as Moyea. Would prefer to use NIS than MS but don’t want to spend 10 more hours fixing this. Would hope a NIS update might fix this problem? Or does someone have a solution.