I run Windows XP/sp2, with IE6 and Firefox 5.0 web browsers, and Norton Internet security, which I have today upgraded from 2006 to 2011. I then did a Live Update to make sure I'm up to date.
NIS 2011 is a bit more intrusive than 2006. However, most things seem to work OK after the upgrade. The only problem I've discovered so far is that Google search now fails when I run it under Firefox, 5.0, but works OK under IE6. In fact the "I feel lucky" button works fine, it is only the "google search" button that fails - it simply does nothing. Other search engines seem OK, eg AltaVista Yahoo.
Any suggestions?