To dream that you have AIDS, indicates that your psychological integrity is being attacked. You are unable to defend your position in some matter.
To dream that your mate has AIDS, suggests that the relationship may be a destructive one.
To dream you have ANY dread incurable illness is a fear that something is permenantly wrong with you. This could be as broad ranging as feeling your carreer choice was bad, to as simple as a fear you will never get over the cold you have. To dream of others with aids is indicative of feelings of helplessness or sympathy depending on the context of the dream.