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go to mojang support center and look up in the bar above your screen "how to delete my mojang account"
It means, that your account is hacked. delete your .minecraft folder (backup save files) and change your password on minecraft.net. Redownload minecraft and it´ll work.
Just delete the folder with your Minecraft server stuff and you're done.
You go to run. Type %appdata%, then into the Roaming folder, into .minecraft, then saves, then pick the world you want to delete, right click and delete.