Make sure that the DVD that you’re using is clean. Not always the easiest thing to do when you have kids, but worth it. Oh, my, yes.
…Whaddya mean, Blu-Ray doesn’t work in PCs?
Is there any way around this? – I mean, besides yanking the CD-ROM drive and replacing it with a Blu-Ray one, assuming that they make those. I haven’t really looked any of this up yet; when it comes to technical stuff there’s usually a reader out there who can and will explain things.