|You don't need to able to play a DVD just to make a copy of it - all you need is some dedicated burning software that can copy discs, or that can create a CD/DVD image file and write it to a blank disc.|
IMGBurn is small & free: http://filehippo.com/download_imgburn/
Put original DVD in your DVD drive.
Close the autoplay box that Windows may open.
Open IMGBurn and use it to create an image file of the original DVD, on to your hard drive.
When that's done, take out the original and put in a blank DVD.
Now use IMGBurn to burn that image file on your hard drive to the blank DVD.
The DVD will then contain exactly the same data as the original one.
You can use that image file to make as many copies as you like with IMGBurn.
Make sure the blank DVD is the same type as the original to ensure it will play on your DVD Player (eg DVD-R or DVD+R as the case may be). I don't recommend the use of re-writable discs if you want it to be reliable and last a long time.