so I've already tried doing this and it never boots correctlyYou can use the media creation tool from microsoft to download the 64 bit iso and create a bootable usb or dvd and you can then clean install 64bit. Link Removed At some point in that tool you can select 64 bit and it'll download that for you.
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where can i get rufus?Use the tool to create an iso and use rufus to create the media with the iso. If you do select gpt and allow it to create the usb flash drive. It's the way I normally do it as my flashdrive is 64gb and the windows tool doesn't create it properly.