Hi Pau1JB. There are 3 places that there can be a problem that causes this to happen. It can be in Windows, the motherboard or the drive itself. If you have a CD-ROM drive as well as the CD-RW drive, you could swap them over (changing the master/slave selector if necessary), and see if your computer recognises the CD-RW in the new position. If it recognises the CD-ROM drive in both positions, but not the CD-RW in either, then you'll know it is the drive at fault.