You're pretty safe to just copy the whole LFS folder across, unless you're having problems and want a fresh install.
If you're going with a fresh install you should copy the cfg.txt file and you're script, settings, skins and skins_x folder across to keep your settings. If you have custom engine sounds you'll also need the engine and sound folders. If you installed any custom textures you ight want to copy your dds folder across as well.
I'd just use your old LFS folder on the new pc :thmub: