Could not execute menu item (internal error) :The service has not been started

When working with WampServer the icon always stays yellow/orange and never turns green.
I found the solution!
under Apache open the httpd.conf and change the lines

#Listen 12.34.56.78:80
Listen 80
to
#Listen 12.34.56.78:80
Listen 8080

Save the file and select “restart all services”
it works!
That just means that something has captured port 80 before apache can get hold of it.

If you would like to know how to find the offending process.
Open a command window "Run As Administrator".
Then run
>netstat -aon
Look at the output under the "Local Address" column for something using :80