Kidderminster earned their third win in a row, and fifth in six games, to stay firmly in the play-off zone.
Anthony Malbon headed the opener from Amari Morgan-Smith's cross before Phil Jevons was denied an equaliser when Daniel Lewis saved his penalty.
Marvin Johnson doubled Harriers' lead from the edge of the area before Malbon made it three from 18 yards out.
Substitute Greg Pearson tapped-in a simple fourth when Malbon's shot came back off the post.
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