Problem:
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.
Solution:
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".