Turn on IIS at Windows Server 2008 R2.

This has a pretty good cheat sheet.

1. Right-click on the "Computer" icon at the desktop and pick "Manage" from the menu that appears.
2. At the "Server Manager" pane which appears click on "Roles" at the left and then "Add Roles" at the right.
3. The "Add Roles Wizard" appears. Here, click on "Server Roles" at the left and then the "Web Server (IIS)" checkbox.
4. Click the "Next" button and walk through the wizard!