Since nobody has stepped in to help...
I'm not sure whether it's possible to use Disk Copy to make DVDs which can be read on PCs.
All the postings I've read which speak about cross-platform data DVDs mention using Toast.
If you're using iDVD to make a video DVD I suspect that'll be readable on any PC which can view a rental DVD.
This is off the top of my head, rather than something well-researched. Sorry.