Beyond Evil (1980) 
John Saxon plays an architect who moves into a new house with his wife, who in turn gets possessed by the spirit of a witch who was killed there over 100 years ago.
A trashy, yet somewhat enjoyable schlock-fest from Graduation Day's Herb Freed, and whilst there is nothing really new on offer here, the effects are fun and Saxon puts in a solid performance, as does Lynda Day George as his possessed wife struggling to maintain a grasp on her own identity as the witch's spirit begins to overcome her. This results in some thrills, kills, and spills, heavy candle use and some flashbacks throughout.
The ending is pretty corny, but there were enough green laser beam eye effects and random objects flying around to keep me entertained during the finale.