After Norton AntiVirus 2005 was crashed for the third time in a year and I should perform a clean installation again, I changed despite the warning of Amazon customers to AntiVirenKit 2005. The first 3 days it has here and there been problems. But that had to do with the fact that more than 50 files were infected on my system with Vitren that Norton has not found. Since everything is cleaned up, you can feel also no system slowdown more. That examination of the hard drive lasts 4 times longer than before, does not bother me. The program runs in Hintergrung while you continue to operate normally. I now have a much greater sense of security. At the turn I create GData InternetSequrity 2006, to secure overall protection while surfing the Internet.