I'm slightly out of my depth here - I don't do this sort of stuff often
but you can't just bung a dvd onto a cd
firstly .... it won't fit
secondly you need the film to be in a format your DVD player can see
If you are already doing this to your satisfaction - look in the software and see if it can create VCD (video CD!!)
there is software you can use
http://www.dvdfab.com/dvd-fab-platinum.htm
a much easier way is .... sit down and watch some telly tonight .... nip to tesco, maplins or (god forbid) pc world and buy some more DVDs