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I`ve been on the search for a specific horror/thriller for quite some time now, but I can`t remember neither the title nor name some of the actors in it. I guess it`s from the mid/late seventies but I`m not quite sure...

The film: A woman lives alone (with one or two of her kids??) in a house, wich is haunted by some kind of mad/furius/crazy spirit, who torments her in every way and everyday. This spirit is of course invisible and there is no way this woman can guard herself from him: he shouts at her, beats her up again and again and eventually rapes her(U see her breasts being "touched/massaged" by his invisible hands in one of the scenes) Nobody believes her, when she states that all of her bruces is made by this spirit, but eventually a small group of scientists believes her story and tries to help her: a full-scale model of her house is made and the scientists "freezes" the spirit while the the woman hides in a special chamber made for this event. After this the spirit/ghost is assumed dead, but in the end when the woman returns to her real house, U see her go inside and the door slams behind her, while the spirit shouts: "Welcome home, bit**!"

Does anybody know the title of this film or do you in any way know how I can recieve more information about it?? Pleaaaaze help me if U can...
Sincerly: Mette from Denmark:(