My car squeaks REALLY loudly when i drive. I'm not sure what it is?

What is your question?

I've been told it could be the driver belt, or other belts. Or it could be the tire alignment? Also, The vehicle shakes when i drive. I've been told that could be due to air pressure levels being different in the tires or AGAIN the tire alignment. I've had the vehicle for about 2 months now, and it was like this when i bought it. Not sure what to start with?