DVD not working!!! Disabled???

[Martin]

I have recently noticed that my DVD drive not working -
not showing up as drive on My Computer
I checked System Information and got the following info -

Generic STEALTH DVD SCSI CdRom Device
SCSI\CDROM&VEN_GENERIC&PROD_STEALTH_DVD&REV_\2&3243CB57&0&
000 This device is disabled.

HL-DT-ST DVD-ROM GDR8161B IDE\CDROMHL-DT-ST_DVD-
ROM_GDR8161B_______________0100____\5&D2A479A&0&0.1.0
This device is disabled.

Image Simulation SCSI CdRom Device
SCSI\CDROM&VEN_IMAGE&PROD_SIMULATION&REV_1.0G\1&2A
FD7D61&0&000 This device is disabled.

I don't know how these all became disabled. Can anyone
tell me how to enable?

Thanks in advance

Martin