@Ramhound - sorry, I will edit: I have removed windows 10 but then I wanted to install Windows 7 and cannot. I have formatted with Windows 7 those partitions with the same result. I am afraid that Win 8.1 / 10 technology involves installing something in the partition table or something that remains after …... According Microsoft, if you're running Windows 7, Windows 8, or Windows 8.1 and your system language isn't English, Brazilian Portuguese, or Chinese Simplified, you will not be able to keep your installed applications and Windows settings while upgrading to Windows 10. Only your personal files will be preserved.
At this point you can choose to keep the partition for installing future builds of Windows 10 by simply formatting the partition to remove all the Windows 10 operating system files (Step #8) or use the space to increase the size of the Windows 7 partition (Steps #9, 10 and 11).
There's a possibility that Windows 10 may be able to accommodate your desire to go back to Windows 7. Use Windows 10's search and look for "go back". You may well find "Go back to Windows 7" (or 8.1) at the top of the results.
Installed Windows 10 but now I can't delete old Windows 7 files. Everytime I try to delete I get the need Administrator Permission message but still will not delete.
With Windows 10, Microsoft made the biggest change to the Windows platform ever, in its history. Right from integrating their digital assistant into the OS, to shifting to a subscription (Windows as a service) model, Windows 10 marks the end of the conventional release cycles.