DVD ROM not working properly

Can you check whether you Disc Drive is well connected ?

to check the device :


Right click on my Computer

Select Properties
Check your Dvd/cd drives.. whether everything is connected.

If not try re-installing the device or to update it.
second solution:
go to computer management -> disk management
see if your drive is listed in right window
for xp read this

did you install drivers for that , i had samsung try to install new firmware

Right click on my computer --> manage --> disk management and check to see if it has a drive letter assigned ( you should be able to right click on it and assign a drive letter if it does not have one.

If not then look at my tip here

http://www.fixya.com/support/r2099529-cd_dvd_missing_video_codec_video