This is confusing me. When you use it in a normal DVD player Windows cannot read from this disk? What do you mean by a normal DVD player - a DVD ROM mounted in another computer, or a standalone (in which case, where does Windows come into it?). Can you let us know what sort of files you are writing and in what format they are being written?
If the data can be read back from the drive that has written it, then test it in a third drive. If this refuses to read then it's probably the writer at fault. If it reads OK, then go for the first DVD player, if you follow my drift. If you're talking video files, then post back as life gets more complicated.