Disabling extensions when Rekordbox will not start

A low end Windows system can have trouble starting Rekordbox with extensions (like Track Separation) enabled. You can disable extensions by editing a config file in Notepad.

Press "Alt+R" and then type/copy/paste this:
"notepad %appdata%\Pioneer\rekordbox6\rekordbox3.settings"

Search for these keys. Value "0" to disable or "1" to enable:

<VALUE name="LightingEnable" val="0"/>
<VALUE name="EnableDVSFunction" val="0"/>
<VALUE name="LyricEnable" val="0"/>
<VALUE name="TrackSeparationEnable" val="0"/>

Save and close Notepad. Then start Rekordbox.