disk detection problem

I HAVE A SAMSUNG DVD DRIVE AND A SAMSUNG CD-RW DRIVE ON NY
SYSTEM, AS FAR AS I KNOW BOTH ARE INSTALLED PROPERLY, BUT
ONLY THE DVD DRIVE READS DISK. IT SEEMS AS IF THE CD-RW IS
RECOGNISED BY THE COMPUTER BUT NOT BY WINDOWS XP. I HAVE
TRIED SWAPPING THEM TO A DIFFERENT IDE PORT AND SWAPPING
THE JUMPERS TO SLAVE/MASTER AND MASTER/SLAVE, BUT NOTHING
SEEMS TO WORK.I HAVE HAD ALOOK AT THE REGISTRY, BUT AS I
AM A NOVICE, I DON'T REALLY KNOW WHAT TO LOOK FOR. I AM IN
DESPERATE NEED OF HELP AS I CANNOT BACK ANYTHING UP OVER
144MB. I WOULD BE GRATEFUL FOR ANY ASSISTANCE ANYBODY
COULD PROVIDE, THANK YOU.