How do I reinstall windows 10 on a machine originally on win 7

I have a win 7 machine and I followed the prompts for installing windows 10. at the time I installed 32 bit.  I got more ram (now total of 6GB) and want to install win 10 64 bit.

Where do I start?

thanks!
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McKnifeCommented:
Download the media creation tool, create a 64 bit usb setup drive or a 64 bit setup dvd, install and skip entering the key. It will activate on its own when done.
BeGentleWithMe-INeedHelpAuthor Commented:
thanks..  1 last question

Download the media creation tool

from where? : )

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