A common practice at Microsoft is to upgrade your operating system every time you install one of their applications (hey, when you own both markets you can do that). For example, when you install Internet Explorer 5 under Windows NT, it replaces the task scheduler with a new one. Unfortunately, there’s a big old security hole in the newer task scheduler that can be used to obtain Administrator access. The real problem here is that no reasonable user would expect that installing a Web browser would replace other, completely unrelated, components of the operating system. What a security nightmare. Get some discipline, Microsoft.