Check back xampp control panel with admin permission. If Apache and mysql is installed (if not install it by clicking on box and showing green tick is mean installed).
Secondly use keyboard shortcode ctrl+shift+del to delete cache data of browser for unwanted results given in execution.
Lastly i think u using right directory for web apps. (localhost(Apache for php and commons) run on htdocs directory at root and localhost: 8080 (tomcat) runs on tomcat/webapps/)
If all things are correct try to rewrite what is problems
