Well, I discovered the solution and it was (obviously) right under our nose, right here in LinuxQuestions. Here is the link to the topic: http://www.linuxquestions.org/questi...03/11/4/113182
However, it was possible to be found only on Google.
You should know probably that you should enable the view of invisible files in order to be able to replace the .xinitrc file in the home directory.
Hope that helped.