When WAMP Server is installed and a directory alias is configured, the following error is encountered when trying to access the site;
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Start WAMP Server from the Start menu.
Click the WAMP icon in the notification area.
Select Apache, then Apache Modules.
Scroll the list to rewrite_module and select it.
Click the WAMP icon again, then click "Restart All Services".