UPDATE: I updated this post slightly to address some good criticsm from Rob Mensching by removing the MsiZap section. Note that this post does not blame the Windows Installer for the few problems we have with ASP.NET MVC installations. The major culprit tends to be either devenv /setup or ngen.exe. The point in this post is to provide tools for those who are very careful, know what they are doing, and really want to take a peek at how the installer works. These tools can help provide insight to whether the two culprits I just mentioned really are...