To see your wife in your dream signifies discord and unresolved issues. Pay attention to how you feel in the dream as it may highlight feelings that you are not expressing in your waking life. If you do not actually have a wife, then your dream wife symbolises the feminine aspects of yourself. Perhaps you may even be expressing a desire to be in a committed relationship. Or the dream may just be a reflection of your waking life and bear no real significance.
To dream about your husband’s deceased wife suggests that you are trying to connect with your husband in the same way that she connected with him. You can’t help comparing yourself to her.