I never saw something like this. You may try two options: - Install elementary with language english. It may displays a readable error message instead of "?????" ? - Create the bootable usb or dvd again, its content may be broken? Good luck !
Hi Viktor, you should download & try the new Installation ISO from https://elementary.io , there's a new Version 0.3.1 online now. Please let us know if it's better with that.