You could request the OEM to send you a 64 bit disk. MS doesnt "provide" any downloads, you need to locate the installer yourself. You could borrow a disk from a friend or google for a clean downloadable iso, then clean install home premium (you cant upgrade install from 32 bit to 64 bit) and activate with the STICKER key.
The edition of the disk you borrow or download is immaterial, you can unlock all editions with this method, then install home premium.
Windows 7 Universal Installation Disc - Create