Why isn't my car working?

I have a 1995 Nissan Altima. The other day my car died. I tried to jump it, but after I turned the engine back off, it was dead again and wouldn't start back up. So, we had a electric charger and charged it that way, it turned on and has been starting up and running for a week... but anything electric (Stereo, windows, signals, speedometer, etc) wont work or turn on. Is there anything I can do before I take it in...which I don't wanna have to do.