I've heard lots of people say Norton slows their computers down but I've been using it for the past 7 years and it's never slowed my computers down. Never had a problem with viruses or the like either as every time I do get something it's always been, well, from porn sites and it catches the threat and gets rid of it. But like I said, Kaspersky is the way to go now. Just do some searches on the best programs available now and choose for yourself as everyone will have a different opinion, just like car stereos