Hi,
This means that you have completely overwritten the files in wamp/www/ that corresponded to the Wampserver homepage'http://localhost/'.
This is not what was requested for your VirtualHost.
You must not modify or replace folders and files that exist "basic" in the folder wamp/www/
As explained in the links that were previously submitted to you, you must create your own folders in wamp/www/, for example wamp/www/mysite1/ and it is in these folders that you put your sites.
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Documentation Apache -
Documentation PHP -
Documentation MySQL -
Wampserver install files & addons