CD Drives get vanished !

[~*McoreD*~]

I didn't removing any burning app. I am using Nero Burning ROM 5.5.9.17c
For more info:
I am having

MAXTOR 20GB HDD as PRIMARY MASTER
QUANTUM 6GB HDD as PRIMARY SLAVE
CREATIVE 6x4x24x CDRW as SECONDARY MASTER
LITEON 48x12x48x CDRW as SECONDARY SLAVE

I tried System Properties > Device Manager and Scan for new hardware. Still no luck displaying my CDRW in My Computer yet