Changing language for installtion

By mistake I installed Studio 2015 with an interface language I don't like. I would like to go back to English, but after disinstallation (three times) and rebooting the pc, I find myself with no language options to choose and the 'wrong' language as default language. How can I get rid of the settings once and for all and get back English if disinstallation and rebootning is not enough?

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