Hey all first post so hi

I recently downloaded, installed, registered Imtoo dvd creator to create playable dvds from some mpegs I have. I do everything as per the tutorial on the imtoo website but when I load the dvd into the dvd player it says no disc.
I know the dvd player reads burned cd's and dvd's and I've tried both Pal and Ntsc formats. ALso when I try to play the final dvd with windows media player, media player just shuts down abruptly.
If you can help me out here i'd be greatly appreciative. If you need anymore info please post here.
Thanks