Car randomly won't start, died while driving when I tried to roll down the windo

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My mom gave me the car. She had some backyard mechanic replace the ignition a year ago. Since then, it has been having problems. It won't start some days, after sitting for a day then it will start. It wont start sometimes and you have to wait for the security light to shut off then it starts. Last time it died for them, the dome light was flickering and the windows wouldn't roll down. It has only done this a few times to them. I was driving it to work, went to roll the window down and the car just died. It turns over and sounds like it wants to start but wont. My mom thinks it has to do with the guy who replaced the ignition. ANY help would be greatly appreciated!!! Thank you!