It's not clear why you want/need to configure the WAMP server when you already have VisualSVN Server. VisualSVN Server includes Apache HTTP Server and you don't need to setup second HTTP server instance. VisualSVN Server configuration should be done via VisualSVN Server Manager console only, see the Getting Started guide.
NOTE: It's strongly discouraged to install any other web applications on VisualSVN Server's Apache HTTP Server. The Apache is configured to serve Subversion repositories only and must not be used to host other web services. Use another web server to host web apps.