Note:  Be sure to run the setup as administrator.

For NetClassroom
  1. Uninstall NetClassroom.
  2. Reinstall NetClassroom.
For Faculty Access for the Web
  1. Uninstall Faculty Access for the Web.
  2. Reinstall Faculty Access for the Web

If the issue persists or if the error occurs when attempting to uninstall, open IIS and check the TCP bindings.  This error may occur if there is no HTTP binding.
To add a binding, see the following article for Windows Server 2008, see