I had installed the Norton 2005 until a week ago. System: 2GHz Centrino. With Norton the start of the laptop lasted much longer than the AntiVirusKit. Norton braked Windows deutlichst !!! That was one of the main reasons I switched wegendem. Norton detects as usual, not all viruses. I can confirm only! AntiVirusKit has discovered a Trojan, Norton did not know him, nor the latest version MC Afee also not, Panda, just not me known scanners. Tested at friends who bought the scanner. AntiVirusKit is simply the best scanner of his money is definitely worth it. AntiVirusKit is not a resource eater, I would say a donor! Norton2005 is a resource-eater! I would buy in the future without hesitation, the 2006 Revision!