You have to start apache first:
go to xampp/apache/setup_xampp.bat
or if you've already run this file:
xampp/apache/xampp_start.exe
after that go to:
go to xampp/apache/apache_installservice.exe
and to:
go to xampp/mysql/mysql_installservice.exe
now you should be able to view the xampp screen by going to
http://localhost/
and then clicking on either english or german