My DVD is not playing on my desktop - plays on my Win7 laptop and DVD

For some reason a particular DVD made on a Mac (it's a slide show made with Fotomagico) does not play on my Win7 Ultimate Dell desktop (all other DVDs play fine), but plays perfectly on all other devices. When I insert the disc into either of my 2 drives, it shows as having no content, and the computer wants to burn the disc. On all other laptops and DVD players the disc just starts playing after it's inserted. Any suggestions?

A very strange problem indeed - the discs appear blank. I would immediately suspect your desktop optical drives-media compatibility issue. Update both your drives with the latest available firmware and then check.