Help! I receive some DVDs from Netflix and try to copy them, but my computer will not read the discs...says the drive is empty. However, the next disc will read and copy just fine. I can play the problem discs on my DVD player just fine, and I've noticed the problem discs auto-play trailers before going to the menu. Most recent discs with problems are "500 Days of Summer" and "Night at the Museum 2". Is there someway I can get these discs to play so I can copy them?