If the disc is still showing the device installed, as you indicate when inserting the CD then it sounds like there is still a registry entry for the printer. There's a couple ways to delete a stubborn registry entry though you need to be careful in doing so. One way is to run the L4 uninstall, another to open the registry and go to the software key, and delete the HP printer key. 3rd is to use CCleaner to remove the key / HP entries. All these options are 'do at your own risk' as if done incorrectly that can cause operating system issues. I'd backup the registry first before proceeding if you choose to follow one of the options.
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