Configuring WCF - Error 500.21 Handler svc- bad module ManagedPipelineHandler

If you  see this error you havent installed the prerequistes for ASP.NET 4.

Try This

1. Open Visual Studio Command Prompt
2. Type the following: 
         aspnet_regiis.exe -i

3. Run the command

4. Try your service again...  it should be working :-)

This basically installs the necessary ASP pieces to get your service up and working!