I started this thread so that I wouldn't continue to pollute Kees1958's thread. Like many of you out there, I've taken a keen interest in Avast! 5 and it's low overhead. Thus far, I've tried all versions, and have only noticed issues with the free version. I know that they claim that aside from the missing Script Shield, and Sandbox, everything is the same, but I'm not so convinced. When I installed the free version, the Mail Shield refused to start, so I browsed over to their forum and performed the recommended repair, and it now works like a charm. Why didn't this happen when I went from Pro to the IS suite? I'm only running the File, Network, and Behavior shields. So in reality, the free version should suit me, but why don't I feel safe? Is it my inner weakness of wanting to feel secure? Is it borderline insanity, or just my desire to empty my pockets?