I have been previously copying films fro my pc to my nexus 7. But now i cannot do so anymore. I'm not a very technical person and i might have deleted something from its original files. Any answers please? And when i open my nexus 7 from my pc i see lots of files which i don't find when i open my tablet, like ebooks, books, movies etc. With lots of items in them that i don't recall of installing. Any help please