De schijf die u hebt geplaatst kan niet door deze computer worden gelezen

“The last step where the files will be copied to the USB drive. Then you get an error...” - @iGert

Translation of the top dialog:

The disc you inserted can not be read by the computer.

  [Initialize]     [Ignore]     [Remove Media]

So, drive is unmounted at the end of the aTV Flash install; which then prevents the install from copying files?