Burning DVDs? Why is it so hard?

I've been trying to burn a DVD for a about a day now, and my second try is currently trying. I used Windows DVD Maker to put it together, and it is currently at 44.8% burned. Yesterday it took a long time to put together the DVD in the first place, then when it was almost done burning, it said that it cannot burn the DVD because some of the files are corrupted/un-viewable. I even checked all of the files before adding them to the DVD. Why is this so hard!?

Hopefully it will work now. If it doesn't, I don't know what I'll do. Burning this DVD isn't all that important, but I'm going to give multiples to some of my friends so it needs to work! Since what I'm putting on this DVD are my videos that I created, I would love to add a commentary of sorts like proffesional DVDs have, but Windows DVD Maker won't let me. Is there an easier program that you might know of that can put together a DVD easily AND with commentary and/or other extras add-on-able? That would be a BIG help if you did know of such a program. In the meantime, wish me luck with this current "burn"!

PS: It is now at 47.7% :-/