I am having a problem with our Exchange box where the IISAdmin service wasn't starting causing other problems. I went through the process of uninstalling IIS. Now I am trying to re-install but the W3SVC service does not install. Everything else that I select for IIS installs correctly but non W3SVC installs which is preventing me from fixing Exchange. Any thoughts on why that particular part of IIS would not install? I followed this article to removed IIS and re-install. KB325889.