This has been asked and answered many times, please search the forum first. Something to keep in mind is, what type of install--Installer, Store, Portable--did you first start out with, and what type do you have now.
As you are starting over from scratch, my own advice would be to consider doing a brand new Portable install to a non-Windows hierarchy folder like "C:\MusicBee" and forget about trying to import old settings, especially when the new PC may have different drivers, audio related hardware, folder structure, etc.