Ideally, you will install IIS first, then .NET, then SAT. If you have already installed IIS, .NET, and SAT, you do not need to uninstall and reinstall everything, but you will have to re-register IIS using the ASP.NET registration tool after you install .NET. If you are using SAT on a 64-bit system, you will just need to allow 32-bit applications in IIS and run the ASP. NET registration tool (in that order). For other IIS7 and SAT errors, refer to the articles below and Knowledge Base article Q10510 - FIX: Secure Ad Hoc Transfer errors with Microsoft IIS 7.