[Japo]

I'm no expert about the registry but yes, HK_LOCAL_MACHINE is for the configuration of the computer itself --as opposed to the different user accounts whose keys are somewhat homologous but obviously don't include hardware. Within the HK_LOCAL_MACHINE folder there is a HARDWARE one but it's not obvious to recognize what's inside and I do not recommend you erasing things you don't know about, let alone the whole HARDWARE folder. That could end up badly.

If you really want to know how to do it via registry and nobody here can help you further, ask in some specific forum. AND every time you're making changes in the registry export it as a backup and set up a rollback point.

However as Scatty said, try first through the Device Manager. Do as he said or double click on your device --if it isn't properly configured it will show a yellow exclamation mark-- to access its Properties and tweak with the buttons there --update, troubleshooting, reconfigure, etc. I've done that several times some hardware wasn't properly configured at first, it can stay with the exclamation mark for as long as it's necessary and you can access and reconfigure each device at any time.