What can i do to stop Steam from booting up when my pc is turning on?

[JustVoody -_-]

Hello!I have problem with Steam Client. I have already wrote to steam support and they said i need to write to Microsoft support.So what's the problem. Every time i turn on my pc steam boots up. I have already tried to disabling that in Steam settings but it didn't help and i tried to disable it through the task manager but that didn't help either.

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