I use Pinnacle 8 - at least I have just today installed 9 - gulp - and I don't say it's wonderful but I don't have all the problems I see described in this forum. But you do have to go a round about way sometimes.
I don't have a DVD burner, but my son does, and we have a family network, so he can do the burning for me. I just made an 18 minute video of the wedding of one of his friends. For quality reasons I wanted a DVD. I made a supposedly DVD compatible mpeg file in make movie, but his burning software said it wasn't compatible - we burned it anyway and it plays on the computer, presumably as a data file, but not on a DVD player.
So...he got TMPGenc and opened the mpeg file in that, and it was fine and burnt it to DVD and everything, no need to use Ifoedit or whatever.
As for rendering....this is where I go the round about route. There were lots of 'effects' - not actual fx but I had to adjust the light as the room the wedding took place in had a big picture window behind the Bride and Groom, so they were in shadow, my son didn't know how to adjust for that in my camera so I had to do something in the edit.
I rendered it to an avi file, then opened the new avi file in Pinnacle, stuck it on the timeline and rendered that as the DVD mpeg. Definitely way better than 15 mins per min of video. I often make an avi file of the edited film, then put that on the timeline to do whatever actual end product I want. As Pinnacle has a problem rendering stills with titles, for example, that solves that as well, put the titles on after it's an avi file.
108 minutes is a bit long tho to make an avi file of, unless you have the NTwhatever it is drive (I do), the FAT32 limits you to about 17 minutes per file. Maybe do it in bits and join them up?
If you do make an avi file, when you first open it, stop it making the thumbnails asap, otherwise you have to drag them individually to the timeline.
All I can think of to help, at the moment.
Win XP, Athlon 1.8, G force 3 T, 1 60gig drive + 1 250 gig, Pinnacle Studio 9 plus mostly, Premiere 6, and Vegas 5 sometimes, Soundforge, Cool Edit.