I think you have any invalid redirect or rewrite or similar in an .htaccess file. Therefore all links relating to
http://fileth.pl do not work. Probably a redirect to "localhhost" or so, i think you have installed WordPress under localhost, what does not work if you want to reach it from outside.
Its not a Xampp issue, its either a User issue (you should have installed WordPress under fileth.pl) or a WordPress issue.
Its extremely hard to find out any more, as your information is extremely poor, you even did not mention that you are running a wordpress installation.