How to solve a “HTTP Error 404.3 - Not Found” error?

Question

Simple problem. I start up VS2008 and create a new WCF Service application. This will create a default application with a few test methods showing it works. I press CTRL+F5 and

Answer 1

Click Start -> Run cmd and type:

cd "\Windows\Microsoft.NET\Framework\v3.0\Windows Communication Foundation"
ServiceModelReg.exe -i