There are number of posts on this and I have tried many a things by now. But to no avail. Myself a Winforms Developer basically, started working on this Web stuff few days b
Just to add to these Anniversary Update issues (thanks Microsoft) if the file you are missing is cgi.dll, ie your Event Viewer has
The Module DLL C:\WINDOWS\System32\inetsrv\cgi.dll failed to load. The data is the error.
Then to fix this:
IIS ManagerConnections panel (typically your PC name)Management, you should have Web Platform InstallerProductscgi then hit IIS: CGI then click Add on the right and finally Install on the bottom