Backup Exec Autoloader Missing

We have reinstalled backup exec on the Media server. Once we finishe that on Device Manage the Media Changer give errror "Windows cannot start this hardware device because its configuration information (in the registry) is incomplete or damaged. (Code 19)" , we have tried to uninstall and install but still same error. We use HP StoreEver 1/8 G2 LTO-4 Ultrium 1760 SCSI Autoloader and Backup Exec 201 R3 . 

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