NO NEED TO SHOUT!
DVD-Video format requires the correct file format (VOB, IFO, etc.) I think you want to burn a data DVD, but what format you use depends on the player that needs to display it.
That must be an awful lot of slides if it takes a DVD to hold it. Most people use SVCD or VCD for that sort of thing.
Current drives running here: ND-2500A, ND-3500A, ND-3520A,
LTR-52327S, SOHW-1633S, SOHR-52A8S