For WAMP Server 3 and above Version:
In WAMPServer 3 there is a Virtual Host defined by default. Therefore the above suggestions do not work. You no longer need to make ANY amendments to the httpd.conf file. You should leave it exactly as you find it.
Instead, leave the server OFFLINE as this funtionality is defunct and no longer works, which is why the Online/Offline menu has become optional and turned off by default.
Now you should edit the \wamp\bin\apache\apache{version}\conf\extra\httpd-vhosts.conf file. In WAMPServer3.0.6 and above there is actually a menu that will open this file in your editor
