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#21
Assuming the eMachines is legacy BIOS, because if it was UEFI you could boot from USB flash drive:
1. You would use the diskpart clean command to completely erase the HDD from the eMachines.
2. Convert MBR to make sure the drive is MBR.
3. Create a small, primary partition, 100 MB is sufficient, mark it as active, format as NTFS or FAT32 (NTFS is standard for legacy BIOS). This will be the system partition. Assign it a drive letter.
4. Create a second primary partition filling the rest of the drive. Format as NTFS. This will hold the OS. Assign it a drive letter.
5. Mount the ISO file containing the Winodws 32 bit OS. The mounted ISO file will get a drive letter.
6. Use the dism /apply-image command to apply the correct version (specified by the index #) to the second partition you created on the HDD.
7. Use the bcdboot command to write the boot files from the new Windows partition to the system partition.
8. Probably be a good idea to use the bootsect command found in the boot folder of the mounted ISO file to make sure the MBR is set up for booting on the eMachines hard drive.
9. Move the hard drive back to the eMachines computer.