Missing explorer columns

[bsnappy]

I seem to have lost the extra columns when in the details view (Artist, duration etc)

It seems to have affected every folder (music, videos, pictures, docs etc.)

Does anyone know how to fix this? I've searched here and on google but not found any answers.

I think it's a dll that isn't registered or a registry entry.... which/what though i don't know?

(Yes - it is a music folder in customise folder settings)