A fairly common problem I've witnessed is that of CD and DVD drives "disappearing" from the system. Opening the device manager shows them to be present, but with the yellow exclamation symbol indicating a problem. Attempting to uninstall or reinstall the devices doesn't solve anything.
Here's the fix, it's a registry hack :
Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class
Find the key {4D36E965-E325-11CE-BFC1-08002BE10318}
then delete all VALUE data from UpperFilters and LowerFilters
Note DO NOT delete the key or the strings! only delete the VALUE data!
Exit and reboot. Problem solved.
Usual disclaimer : don't go poking around the registry if you don't know what you're doing. If you bork your system, it's your fault and nobody else.
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