However, you should be able to rip the the contents of the DVD onto an .iso and then reburn it to a blank DVD.
I would use ImgBurn.
Open ImgBurn, click "Create image file from disc."
Then allow it to create an iso file somewhere.
Once that is finished, insert blank DVD and click "Write image file to disc."
It is a fairly simple process that SHOULD work, but it may take quite a lot of time depending on the size of the disk/data.
EDIT: Forgot to add download link... it is in the Source.