Every time I go to a meeting at work where there's a shared computer in the conference or meeting room, here's what happens: 
  1. User starts the computer and waits for it to boot.
  2. User logs on.
  3. Computer displays "Welcome..." for 5 minutes.
  4. Computer displays "Setting up your desktop..." for 5 minutes.
  5. User closes the various popups and program setup windows and starts Powerpoint.
  6. Computer asks user to identify self.
  7. Computer flashes a variety of useless, obtrusive features of Windows software.
This is dumb.  And it feels like one of those things Microsoft should've worked out by this point.  The only thing people want on a shared computer is simple, quick access to the features they need right away -- basic file management and office software.  Why isn't there an option on the login screen called "Quick Start" or something?