I have created install media but do not have a product key. The 'Windows' partition is clearly the C drive. I believe the partitions labelled 'Recovery Partition' are related to OneKey Recovery but it is not clear to me what the 'EFI System Partition' or 'OEM Partition' are. I would however like to keep this for potential future use, provided this does not interfere with the installation by installing software onto the fresh installation. I do not wish to use Lenovo OneKey recovery as this does not leave a fresh Windows installation but one with lots of Lenovo pre-installed software. I wish to reinstall a fresh copy of Windows 10 Home 圆4, which is what the PC shipped with but I am slightly confused as to which partitions I need to wipe, keep or delete as I cannot identify the identity and uses of all the partitions.
(Click on the picture to see the image enlarged) On my Lenovo H50-55 Desktop Computer, I see the following partitions in Disk Management:
