Running help.

[Minchken]

Be glad I actually took the courtesy of fixing this, 'cause somehow, I felt a bit bad for you:

onClipEvent (load) {
    var speed:Number = 0;
    var walk:Number = 6;
    var run:Number = 11;
    var grav:Number = 0;
    var falling:Number = 0;
    var jumped:Boolean = false;
    var jumpHeight:Number = 21;
    var touchingGround:Boolean = false;
    var scale:Number = _xscale;
    var doorOpened:Boolean = false;
    var attacked:Boolean = false;
}
onClipEvent (enterFrame) {
    if (!touchingGround) {
        grav++;
        this._y += grav;
    } else {
        grav = 0;
    }
    if (_root.ground.hitTest(_x, _y, true)) {
        touchingGround = true;
    } else {
        touchingGround = false;
    }
    if (!attacked) {
        if (Key.isDown(Key.LEFT)) {
            _x -= speed;
            if(speed == walk){
                this.gotoAndStop(2);
            } else {
                this.gotoAndStop(5); // running animation
            }
            _xscale = -scale;
        }
        if (Key.isDown(Key.RIGHT)) {
            _x += speed;
            if(speed == walk){
                this.gotoAndStop(2);
            } else {
                this.gotoAndStop(5); // running animation
            }
            _xscale = +scale;
        }
        if (Key.isDown(Key.SHIFT)) {
            speed = run;
        } else {
            speed = walk;
        }
    }
}
onClipEvent (enterFrame) {
    if (!attacked) {
        if (jumped) {
            falling += 0.5;
            _y += falling;
            if (touchingGround) {
                jumped = false;
            }
        } else {
            if (Key.isDown(Key.UP)) {
                jumped = true;
                falling = -jumpHeight;
                this.gotoAndStop(3);
            }
        }
    }
    if ((Key.isDown(Key.UP)) and (Key.isDown(Key.LEFT))) {
        this.gotoAndStop(3);
    }
    if ((Key.isDown(Key.UP)) and (Key.isDown(Key.RIGHT))) {
        this.gotoAndStop(3);
    }
    if ((!Key.isDown(Key.UP)) and (!touchingGround)) {
        this.gotoAndStop(3);
    } else if ((Key.isDown(Key.UP)) and (!touchingGround)) {
        this.gotoAndStop(3);
    }
    if ((_currentframe == 3) and (touchingGround)) {
        gotoAndStop(1);
    }
}
onClipEvent (keyUp) {
    if (!attacked) {
        gotoAndStop(1);
    }
}
onClipEvent (enterFrame) {
    if ((this.hitTest(_root.door)) and (!doorOpened)) {
        this._x -= speed;
    }
    if ((this.hitTest(_root.door)) and (Key.isDown(Key.SPACE)) and (_root.keys>=1)) {
        _root.door.gotoAndStop(2);
        doorOpened = true;
        _root.keys -= 1;
    }
    if (this.hitTest(_root.wall)) {
        this._x -= speed;
    }
    if (this.hitTest(_root.key)) {
        _root.keys += 1;
        unloadMovie(_root.key);
    }
    if (_root.keys<0) {
        _root.keys = 0;
    }
}
onClipEvent (enterFrame) {
    if (Key.isDown(65)){
        attacked = true;
        this.gotoAndStop(4);
        if(this.hitTest(_root.enemy)) {
            _root.enemy.unloadMovie();
        }
    } else {
        attacked = false;
    }
}

Frame 5 is for the running animation, just add another frame inside your movieclip on Frame 5 with the running and hopefully it should work

THANK YOU THANK YOU THANK YOU THANK YOU THANK YOU!!!!!!!!!!!! oh my god thank you so much! You are my best friend! you are so ****ing smart, everyone else was like "your an ******* I ain't helping you!" when it was just they were to stupid to help, but you are so smart and you MADE MY DAY THANK YOU!!!!!!!!!!