First, we should spend some time reading the definitions of archetypes and instincts found in the lexicon (see here). Here are some selected quotes (underline emphasis are mine):
Archetype. Primordial, structural elements of the human psyche.
Archetypes are systems of readiness for action, and at the same time images and emotions. They are inherited with the brain structure-indeed they are its psychic aspect. They represent, on the one hand, a very strong instinctive conservatism, while on the other hand they are the most effective means conceivable of instinctive adaptation. They are thus, essentially, the chthonic portion of the psyche . . . that portion through which the psyche is attached to nature. [“Mind and Earth,” CW 10, par. 53.]
Jung also described archetypes as “instinctual images,” the forms which the instincts assume. He illustrated this using the simile of the spectrum.
The dynamism of instinct is lodged as it were in the infra-red part of the spectrum, whereas the instinctual image lies in the ultra-violet part. . . . The realization and assimilation of instinct never take place at the red end, i.e., by absorption into the instinctual sphere, but only through integration of the image which signifies and at the same time evokes the instinct, although in a form quite different from the one we meet on the biological level. [“On the Nature of the Psyche,” CW 8, par. 414.] (see picture below)
Psychologically . . . the archetype as an image of instinct is a spiritual goal toward which the whole nature of man strives; it is the sea to which all rivers wend their way, the prize which the hero wrests from the fight with the dragon. [Ibid., par. 415.]
Instinct. An involuntary drive toward certain activities.
All psychic processes whose energies are not under conscious control are instinctive. [Definitions,” CW 6, par. 765.]
Instincts in their original strength can render social adaptation almost impossible. [“The Transcendent Function,” CW 8, par. 161.]
Instinct is not an isolated thing, nor can it be isolated in practice. It always brings in its train archetypal contents of a spiritual nature, which are at once its foundation and its limitation. In other words, an instinct is always and inevitably coupled with something like a philosophy of life, however archaic, unclear, and hazy this may be. Instinct stimulates thought, and if a man does not think of his own free will, then you get compulsive thinking, for the two poles of the psyche, the physiological and the mental, are indissolubly connected. [“Psychotherapy and a Philosophy of Life,” CW 16, par. 185.]
An instinct which has undergone too much psychization can take its revenge in the form of an autonomous complex. This is one of the chief causes of neurosis. [“Psychological Factors in Human Behaviour,” CW 8, par. 255.]
Too much of the animal distorts the civilized man, too much civilization makes sick animals. [The Eros Theory,” CW 7, par. 32.]