Click on Start, Run, and type regedit and press Enter Click on the plus signs (+) next to the following folders
HKEY_LOCAL_MACHINE
SYSTEM
CurrentControlSet
Control
Class
{4D36E965-E325-11CE-BFC1-08002BE10318}
This folder is the DVD/CD-ROM Drive Class Description in the registry. Look for any of the following names in the right hand column.
Upper Filters
Lower Filters
Upper Filters.bak
Lower Filters.bak
If any of the above keys shown in step 4 are listed, right-click on them and choose Delete After deleting the keys, close the registry editorReboot your computerOpen My Computer and check to see if your CD or DVD drives have returned. You may also want to open Device Manager and verify that the yellow exclamation and error code on the CD or DVD drive is gone.
if these fail to fix the problem
It could be a problem withthe lens, you should try cleaning the lens, it's already gone bad there is no harm in trying If you take a little risk can solve . follow the instruction: Don't panic its very simply. 1. When running your pc , open the drawer.> 2. switch off the acpower 3. remove powercable & sata or pata cable 4. remove all the screw from the back side 5. press clip to open the font panel 6. reverse the cd/dvd rw 7. just remove the cover 8. clean the optical lance 9. use a little( not much )oil place on two steel shaft 10.cover all the equipment 11.now you can fit to your pc Ifit does the same problem please change the cd/dvd rw because the lance has defected
hope this helps
don
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