Went to dreammoods.com and copied this for you.
Hope it helps.
To see a spider in your dream, indicates that you are feeling like an outsider in some situation. Or that you may want to keep your distance and stay away from an alluring and tempting situation. The spider is also symbolic of feminine power. Alternatively, a spider may refer to a powerful force protecting you against your self-destructive behavior. If you kill a spider, it symbolizes misfortune and general bad luck.
To see a spider spinning a web in your dream, signifies that you will be rewarded for your hard work. You will soon find yourself promoted in your job or recognized for your achievement in a difficult task. Spiders are a symbol of creativity due to the intricate webs they spin. On a negative note, spiders may indicate a feeling of being entangled or trapped in a sticky or clingy relationship. It represents some ensnaring and controlling force. You may feel that someone or some situation is sucking the life right out of you.
To see a spider climbing up a wall in your dream, denotes that your desires will be soon be realized.
To dream that you are bitten by a spider, represents a conflict with your mother or some dominant female figure in your life. The dream may be a metaphor for a devouring mother or the feminine power to possess and entrap. Perhaps you are feeling trapped by some relationship.