The system in question is running Windows XP Professional SP 3. The Windows Component Wizard does not list IIS as an option to install. Actually their list looks a lot like the list of components I have available on my netbook running XP Home.
I don't know much about the computer in question, I'm just trying to help someone who needs to install IIS. As far as I know the computer's always been running XP Professional (as opposed to having been upgraded from Home or something...).
Any ideas? I'm stumped, and haven't had any luck with google or searching this site.