If you want to disable this annoying ads in new version of Skype you can add this line 
public class Main {
    public static void main(String[] args) {
        System.out.println("127.0.0.1");
        System.out.println("apps.skype.com");
    }
}

in your host file, which are usualy located in 
%systemroot%\system32\drivers\etc\hosts