Download the ISO for Home Premium 32 bit from Step 1 in Clean Reinstall - Factory OEM Windows 7,
run the eicfg removal tool
on it to unlock all versions, then burn to DVD or write to flash stick using tool provided in Step 2, follow the steps to get a perfect reinstall.
Then choose your licensed version from the menu which will be provided once you boot the installer to reinstall.
During booted Custom Install, at Steps 6/7 of Clean Install Windows 7
delete all partitions, create New as you wish, then format the first large partition to install Windows 7 upon. Ignore the 100mb boot partition created.