Before installing the Revit Server, install and configure IIS version 7.0 for Windows Server 2008.
From the Start Menu, click All Programs > Administrative Tools > Server Manager.
On the Server Manager, select Roles.
Under Roles Summary, click Add Roles.
Click Next to display the Select Server Roles dialog.
Select Application Server from the Roles list (only this Role.... NOT the Web Server (IIS)) and then click Next twice to display the Select Role Services dialog for the Application Server role.
Select the Web Server (IIS) Support check box. If you are prompted to install additional role services and features, click Add Required Features.
Expand Windows Process Activation Service Support and select TCP Activation. If you are prompted to install addition role services and features, click Add Required Features. Click Next twice to display the Select Role Services dialog for the Web Server (IIS) role.
Expand Web Server, and then expand Application Development.
Select ASP, CGI and Server Side Includes. Expand Management Tools, and then expand IIS 6 Management Compatibility.
Select IIS 6 Scripting Tools. If you are prompted to install additional role services and features, click Add Required Role Services. Click Next.
Ensure in the summary of selections that the following items are present: TCP Port Sharing, TCP Activation, ASP, CGI, Server Side Includes, and Non-HTTP Activation. If the summary of selections is correct, click Install.
When installation completes, click Close.