I have the lateset version of Nero 7 Ultra Enhanced Edition ... trying to burn avi movies tha ti downloaded from the internet, everytime when I tried to use Nero Vision to burn it, everything seems to be fine, setting is set to Auto fit to disc and doesn't seem to be too big for the 4.7GB DVD disc, but always, in the middle of the burning process, it always tells me that the file is too big for the disc and asks me to insert another bigger disc, but it's already set to Auto fit to disc, why am i having this problem?  my brother used the same program and have no problems burning even two files on one disc, my file is the same size he has, what should I do?  and if I tried to reduce the quality, the audio/video will be out of sync, i need help