Symantec seems to think they can do a better job than Microsoft at protecting the key areas of Vista it has access too. What happened, in the United States, was that Symantec and McAfee started whining about not having access to those key areas, and were on the verge of whining to the U.S. DOJ, and if that would have happened, Microsoft would have been, for lack of better terminology hung out to dry, possibly. Microsoft eventually gave in to the whiner's at Symantec and McAfee and allowed those programs access to those key areas starting with Service Pack 1. Ever since this happened, I have no faith in Symantec or it's Norton Products.
This is not good, as the way Microsoft had things set up with Vista, was that absolutely no antivirus or internet security program would not have access to those key areas of Vista, and those two companies would have to completely rewrite there programs to make them Vista compatible, and the companies mentioned decided one day, no way were they going to do that, so they started whining and got their way about getting access to key areas of Vista, as a result with Service Pack 1, anyone running at Symantec of McAfee product, probably isn't as secure as both those companies would have the sheeple believe.