need help to make a dvd?

Hi all,
I recorded a friends wedding recently on my camcorder, uploaded it onto my pc where its saved as a Windows Media Audio/Video file. I copied this onto a blank dvd but it won't play on a dvd player. Do I need to convert the file first and if so how do I do it? Any help appreciated
thanks in advance

This site is invaluable for this sort of stuff. In particular check out this article/guide.