I want to install engineered wood flooring in my home. Removing the carpet revealed particleboard over the plywood subfloor. I've been advised that particleboard is not a decent substrate for any kind of floor. My options are 1) remove the particleboard and replace with a plywood underlayment, 2) put a thin plywood layer on top of the particleboard, or 3) burn the place down and start over. Any help with the first two would be most appreciated.