Considering the ways that most malicious spammers brutally take over computers you're damned right it's MS's responsibility. How about preventing a site from changing your Start Page without asking you? Or how about preventing the automatic installation of spyware dog crap like Gator, TinyBar, IntelligentExplorer, etc? These things should not be able to install themselves without you knowing it, yet they are. That is a flaw in Windows. A secure operating system would not allow outside entities to manipulate it. I'd be willing to bet that 75% of the users who visit this site are infected by one form of spyware or more. I say infect because they are just as malicious as a virus but you don't notice them. MS must step up to the plate and abolish this trash. The only real cure though would be to prosecute the "entrepreneurs" who distribute spyware.