Web Active Directory’s solutions require the Microsoft .NET framework to run properly. Sometimes it’s necessary to install/register or re-install the framework manually. The ASP.NET IIS Registration Tool allows you to do easily install or re-install the framework.
Check out the article below for guidance to register the version(s) of ASP.NET required for your Web Active Directory applications. You first need to find the proper ASP.NET version (2.0 or 4.0) and then use the 32-bit version for Web Active Directory apps. To register the framework entirely, run the following command. Different switches give you different behavior.
More information at: https://msdn.microsoft.com/en-us/library/k6h9cz8h(v=vs.80).aspx