After uninstalling 4.1, I was again able to access Internet thru AOL. I am reluctant to reinstall Spywareblaster before getting feedback from those who have knowledge in this area. Microsoft Tech Support ( I run XP Home) says incompatable software applications can occur at any time for multiple reasons. I previously had problems opening Firefox 2 after two years with no complaints and uninstalled it after seeing many others had varied problems with it. Prior Spywareblaster editions never caused any difficulty and I would like to be able to reinstall it with confidence that I will not lose Internet connectivity. Thanks in advance to all who read and respond to this post.