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The Emperor promised Anikin that he would able to prevent padme's death if he joined the darkside, padme ended up dying, and anikin lost a lot of power when obiwon choped him up. He was now not powerful enough to defeat the emperor outright so he trained starkiller to do it, and in the movies he tried to do the same with luke, which in a way he did end up doing.
Vader's hunger for power came from his obsession of the death of his mother and trying to prevent padme from ever dying. Once she died, he wanted to destroy everything. Once he found out he had children, he wanted to kill the emperor again.
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