I'd go back to factory conditions via the recovery disks you made (or can order) and then go forward to Windows 10 in stead of backward to Windows 7.
Kees
I have a Gigabyte q2440 laptop with windows 8 installed. I was able to successfully install windows 7 by deleteing all partitions and create new partition and covert it from GPT to NTFS format.After successful installation of Windows on the primary partition i noticed that I am not able to go to Windows 7 boot option until a bootable usb drive is inserted. If i insert a bootable usb drive and do not press any key I am able to go ahead and login into windows 7. I tried to change BIOS options from Windows 8 defaults to Legacy degaults , also tried to change the boot order but no success.Without a bootable usb drive ,as soon as the laptop starts I see Gigabyte logo with F2,F9 and F12 options and after 2 seconds Windows Boot manager menu pops with two tabs(1. Boot menu with no entries and blank and 2. App menu with Setup option which takes to BIOS).
I have tried to use EAsyBCD to restore MBR but no success.I have again tried to install Windows 8 but still same issue.
No updates for BIOS available.
Please suggest possible solutions.

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