Demonic possession is as old as creation and quite real. It can be fought when we understand it, in a non-Hollywood way, and use the spiritual weapons given to us by Christ and His Church.
View this for an excellent, dispassionate explanation of what possession is. It’s 1 hr 21 minutes but worth skipping some mindless TV program to garner the great info from exorcist Fr Ripperger.
These media files are Penanceware, which require that you do one of the following: (1) $1.00 via Paypal (http://www.sensustraditionis.org/inde…), or (2) offer up a decade of the Rosary; or (3) perform some form of penance for the intentions of Fr Ripperger (for each individual media file downloaded). The same rule applies if you copy and distribute to friends.