Not to insult your intelligence, but first make sure the disc surface is clean.
The disc may have been burned using a file structure that Windows doesn't recognize, possibly a Mac specific standard? Or maybe it was burned using either a weak DVD burner or a low quality DVD-R, in either case the burnt in "pits" aren't reading correctly. Or is your HP writer a DVD+R? Just throwing some things out there, I dunno.
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brand new cd, and when i put a different cd in there it works fine. Its a hp dvd writer/cd-writer combo, thats my drive, iono why it wont work, but i need to move all my songs and microsoft word on a cd, and then hard boot pc.