Windows Vista has a lot of things that bother a lot of people. I, however,
don't mind some of the things that bother other people. Vista has a feature
called UAC (User Account Control) enabled by default. The purpose behind this
utility starts many applications in a restricted shell, offering the user a
reprieve from apps that he or she may not want installed. In previous versions
of windows an application can be executed as administrator without the user's
knowledge. This was one method in which many malware infected systems.
Vista, in trying to reduce one avenue for these applications, opted to restrict
applications to this shell and prompting the user to elevate the installer.