pc with windows 10 as the Lumia 550, installed latest version of Zune, to do all the operatopn like sinc, backups etc etc, but the program doesn't see the cell, no difference if I plug the cell before or after having started Zune. with out staring Zune the pc sees, via usb, all the "memory" part of the cell, but naturally, not the system part of it. what do I do wrong. any known issue between Lumia 550 and Zune? is it an issue of windows 10?