I have an external sony DVD that just won't work. I use DVD shrink and decrypter but when I try to burn there is nothing in the file. I have the A, C, D and E drive but no F that everyone seems to speak of. I need help from start to finish...PLEASE!!! Nero came with the sony but it freezes after about 3% of the disc. What am I doing wrong. I'm not computer stupid but I feel like it now!!!