I got ripped off bad but i need help !

My husband and i went looking for me a car i fell in love with a 93 Infiniti G20. So we bought it for $1,200. The a/c does not work, Drivers window does not go up or down but motor for the window runs, and the stereo does not work. Go ahead and laugh now cause i did. I did not know any of this when we bought the car. I am such an idiot !!
But my problem is this. I can live with everything else just not without my radio. The antenna is busted but it has a stock cassette player. Yes i still have cassettes ! Well the stereo turns on but no matter what tape i put in it sounds like i am running a blank tape. The speakers you can hear turn up and down so what is wrong with it? Called a dealership but they want $50 to $80 just to look at it. I do not have that kind of money to spare.
Can someone please help me.
Please be kind i am a girl and have no idea what i am looking for or at.
Thank you