"The Frighteners" takes its time settling into an often unsatisfying blend of comedy and horror. It leaves too many ideas hanging without resolution and far too many unanswered questions. Michael J. Fox stars as a paranormal investigator/eliminator (a la "Ghostbusters") who rids homes of the spooks that he, himself, employs (shades of "Dragonheart"). When the spirit of a mass murderer returns to the otherwise sleepy town in which he lives, he must work overtime to save his own life and that of his girlfriend. The special effects, with one notable exception, are unremarkable and the director shows that he doesn't have the deft touch for dark comedy that the film's executive producer, Robert Zemeckis, posesses.