Thank you, it turned out to be that just before the dvd would burn, a box came up that asked me if I wanted to change to PAL from NTSC, as most of the material was PAL that I was trying to burn. I always said yes thinking that's what I should do then, once I said no it played....I now have another problem though....since I burned the dvd I can't make a cd of some music in windows media player library. I'm using same cd's I always use, same box even, it gets to 98% burned it says, although only 4 songs of 7 are ending up on the cd...then it says it cannot burn to this disc, slow down the speed, disc is dirty or damaged or try different brand of cd's. All ridiculous, I haven't touched the speed, same cd's as usual, used up 4 cd's brand new, so it's not that 1 was dirty. I slowed the speed from fastest ,where it was, to 16x, still same error message. I've done this a million times with same cd's. What now?