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The start menu in windows 10 is at bottom left of the screen.
It's not like the one you see in windows 7 or older versions of windows.
The Start menu in Windows 10 is a blend of the old menu found in Windows 7 and the one in Windows 8. It's more like a menu you see in tablets and smart phones.
Please click this link to know more about windows 10 start menu: Guide to windows 10 start menu
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