When I try to copy a video from my PC to a disk I get a "failed to copy" error message after several hours of processing with no further explanation. I can copy from the camera (Panasonic HDC-TM15) to the PC with HD writer with no problems. I have the same problem with my PC at my office that is brand new. Should i upgrade to HD writer AE 2.1? The Panasonic website suggests that the versions are camera specific.