first of all, make a safe copy now of all related files so you have a good copy while you expeiment.
what you did should work fine. uninstalling and reinstalling LBC wont mess with your own mcf node files.
now:
the .mcf file should have your nodes; the .mcp doesn't hold much, mainly just the knowledge about your .mcf file.
so start launchbar commander, the open your .mcf file.
and see if all of your nodes are there. they should be.
launchbar commander also creates backup files so you should be able to load those too if your main .mcf got damaged somehow.
if not, email me and i can try to help more (
[email protected])