The lite version has most of the spam and spyware removed. I also use anti-virus software, a software firewall, a hardware firewall (router), and use the Adaware software to remove or opt-out of things that are using my computer without my permission. You don't need these tools, but I wanted you to know that I have used them to check on software like KaZaA and found the lite version to be accetable as far as P2P is concerned. Never the less, if your on the internet you should have virus protection at all times, even if your just surfing. I also have a PopUp Stopper which is why I didn't notice the problem with the KaZaA Lite web site.