@Robert > Grab everything from this folder:
Move it all to the same location on your new computer, but if you have a different username on the new drive, you'll need to make some changes...
Right-click on the rekordbox3.settings file and select Open with... and select Notepad.
Next, use the Find to locate these lines:
If they don't exist, that's fine - you should have the top two, at the very least.
In that line, it will have a val and the data for that will be the path to your OLD user's files; you need to update that. For example:
<VALUE name="pioneerDirectory" val="X:\Users\PulseOldComputer\AppData\Roaming\Pioneer\rekordbox"/>
<VALUE name="pioneerDirectory" val="X:\Users\PulseNewComputer\AppData\Roaming\Pioneer\rekordbox"/>
That should be all you need to do, but if it doesn't work, let me know.