ISO 800 is your problem. I can't see a reason for 1/1600 shutter at night. Were you trying to freeze a race car at 200mph? Try it at 200 or 400 and see (if your camera has those ISOs) You can hand hold at the reciprocal of your focal length, so keep that in mind. If it's a point and shoot, try to stay above 1/60 or so, or use a tripod.