Sony CRX880A CD-RW/DVD-ROM Combo Drive "windows won 39 play" Questions

Windows XP which I'm running on. Why am I not getting sound from DVD movies that play fine on other computers? I forgot to mention that music CDs play fine. Thanks! You need a driver for the soundcard

...won't load the disk it says " Let windows help me choose a disk" because D:/ won't recognize it. Any solutions? The CRX880A is a cd writer and DVD reader it doesn't record dvd ...