Unable to delete the option for more operating systems

I am using windows operating system 7 on my notebook, but i wished to use MAC operating system. But when i tried to install that OS without formatting another drive other than Drive C, it didn't install but also this made my personal drive blank.
This action formatted my drive D and after that whenever i start my windows it shows three options of operating system that choose which to start from. I am unable to delete those options from my windows.
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