I don't know much or anything about registry keys. Peerless would be the know there. But the only files I'm aware LW installs is the program folder, the preferences, your LW downld folder wherever you set it to be, & the incomplete folder. Just those items. I think Peerless should expand here on any necessary details about the installation registry. And if it should be a key component to maintain for the new HDD. (Putting you on the spot Peerless sorry!)