Images aspect ratio cannot be disabled. You have to put a 160x160 image (or resize/crop already added images).
For example this code resamples all images to 160x160:
var
i:integer;
begin
for i:=0 to ImageEnMView1.ImageCount-1 do
begin
ImageEnMView1.SelectedImage := i;
ImageEnMView1.Proc.Resample(160, 160);
end;
end;