A common problem is the window switches go bad. You will probably have to replace the switch. Contact gtmorad because he usually has replacement parts for a good price. Can you roll down the passenger window from the drivers switch? The problem with the starting might be the VATS system. It is part of the security system that uses a chip in the key to make sure it is the correct key for the car. You can bypass it, but it is hard to get to the right wires. I am not sure about your other problems, but I am sure others will chime in.
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1998 Supercharged Riviera - Custom CAI, Alpine spx-13ref, Infinity 6x9's, Alpine 4 Channel Amp, Kicker KX3, Silverstars, STB, Hawk Brake Pads, Monroe Air Shocks, KYB GR2