When installing the Web Console there is a couple of components that is required, the Operations Manager 2012 Supported Configuration (http://technet.microsoft.com/en-us/library/hh205990.aspx) list these:

• Recommended processor speed: 2.8 GHz or faster.
• Minimum memory: not less than 2 GB.
• Operating System: Windows Server 2008 R2
• Processor Architecture: must be AMD64
• Internet Information Services (IIS) v7.5 or later, with the IIS Management Console and the following role services installed:
  • Static Content
  • Default Document
  • Directory Browsing
  • HTTP Errors
  • HTTP Logging
  • Request Monitor
  • Request Filtering
  • Static Content Compression
  • Web Server (IIS) Support
  • IIS 6 Metabase Compatibility
  • ASP.NET
  • Windows Authentication
• Default website: must have an http or https binding configured
• Both .NET Framework 3.5 SP1 and .NET Framework 4 is required for setup to run. For more information, see the following.
  • .NET Framework 3.5 SP1 redistributable package
  • .NET Framework 4 redistributable package

 

The role services is easily installed with powershell, which makes it a little quicker then using Server Manager GUI:

Import-Module ServerManager
Add-WindowsFeature NET-Framework-Core,Web-WebServer,Web-Static-Content,Web-Default-Doc,Web-Dir-Browsing,Web-Http-Errors,Web-Asp-Net,Web-Http-Logging,Web-Request-Monitor,Web-Windows-Auth,Web-Filtering,Web-Stat-Compression,Web-Mgmt-Console,Web-Metabase

As you might see I’ve also added NET-Framework-Core  (.NET Framework 3.5.1) there as well.

When the IIS install is ready you should install .NET Framework 4. (http://www.microsoft.com/download/en/details.aspx?id=17851)

If you installed .NET Framework 4 before installing the IIS you’ll get an error:

The ASP.NET 4.0 handler is not registered with IIS 

To fix this, the Operations Manager 2012 Deployment document states that you should run:

%WINDIR%\Microsoft.NET\Framework64\v4.0.30319\aspnet_regiis.exe -r

I suggest that that you add the -enable option (%WINDIR%\Microsoft.NET\Framework64\v4.0.30319\aspnet_regiis.exe -enable -r), that enables the ASP.NET ISAPI extension. And gets rid of this prerequisites error:

Web Console cannot operate properly because the ISAPI and CGI Restrictions in Internet Information Services (IIS) are disabled or missing for ASP.NET 4.0.

Lastly do a restart of the server before running the setup again.