If the only files you have are on a DVD they can't be
imported directly into a computer. You need to use video
capture software and a capture device (either internal or
external hardware) that is connected to a home type DVD
player or you need DVD ripping software that uses your
computer's internal DVD drive (similar to CD music ripping
software.) Search the internet for DVD to MPEG or DVD to
AVI software but remember that MM doesn't like MPEG files so
you will have to convert using another piece of software to
either an AVI or WMM if the software converts to MPEG. For
the software version I use Super DVD ripper. For hardware
ripping I purchased an ADS DVD Xpress DX2 at Sam's club
(they should be available elsewhere) for around $60. Uses
either S video input or RCA inputs. Comes with capture
software that works really well and also Ulead's Video
Studio 9 SE DVD file editing and DVD writing program. I
have captured video from both VHS tapes and DVDs by simply
playing them through the box into the computer with the
capture program supplied.
Since this was a home created DVD, do you have access to the
original files that were created from the old video tape?
If so, use those instead of trying to "rip" the DVD. The
finished product will appear better on the screen (2nd and
3rd generation videos have a tendency to degrade the
output.)