Have you resized all of the photos to no larger than 1000x750 pixels, per the FAQs to the right of this forum?
Also, is your video from a miniDV camcorder, captured over FireWire? If not, what kind of camcorder did your video come from?
Finally, are you able burn your DVD files to a folder on your hard drive rather than directly to a disc?
More details are in the FAQs to the right of this forum.
Along with the answers to Steve's questions:
1.) What is the Duration of your Timeline?
2.) How much defragmented free space is on your HDD?
3.) How are your HDD's formatted, NTSF or FAT-32?
4.) What is on the Timeline at about the 30% point? [PrE uses a 2-Pass Transcode, so @ 50%, the first-pass has completed and at 80%, the second-pass is underway, trying to get the best quality possible to fit the blank DVD disc.]