Your os is WXP, which suggests an older pc.
Is it possible you have a CD drive and not a DVD one?
If it is a dvd drive, have you tried cleaning?
Here in the UK a dvd/cd cleaning disk with cleaning alcohol can be found for £1 in the cheapo shops.
Some drives have two lenses which may explain why your mp3 disks work.
Please advise back on progress.
Good Luck - Keep us posted.