I upgraded my Windows 7 laptop to Windows 8 RTM but the DVD player refused to work. It's a MATSHITA BD-CMB UJ141EF drive in a Toshiba laptop. It was showing a yellow exclamation mark in Device Manager which reported the following error "Windows cannot start this hardware device because its configuration information (in the registry) is incomplete or damaged. (Code 19)". Deleting and re-scanning in Device Manager made no difference.
SOLUTION:
I noticed a service called "TOSHIBA Optical Disk Drive Service" which was presumably installed as part of the original Windows 7 setup. I used "System Configuration" to stop this service and the drive now works correctly in Windows 8.
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