Trying to write a cd,
I noticed my DVD writer was missing,
Looking in device manager i got the following error message :
Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)
very strange, as this device has always worked perfectly before.
After some googleing I tried things to update the drivers, deleting the device from device manager etc.
Finally i found the answer :
Open regedit
Go to key :
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}
Find the "UpperFilters" and "LowerFilters" (and "UpperFilters.bak" "LowerFilters.bak", if they exist) values and delete them.
After that reboot or delete the devices one more time from device manager and voila they were back!
WARNING : some CD / DVD writer programs may have to be reinstalled!!! but that's a small price to pay i find :)
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