Goodmorning everyone. On July 30 - taking advantage of the Microsoft offer - I upgraded my laptop from Windows 7 Ultimate to Windows 10 Pro. Then I formatted the partition C and I made a "Clean Installation" of Windows 10 Pro. I even got a VHD of my old Windows 7 Ultimate. I created the Dual Boot with Diskpart (Windows 7 VHD Default - Delay 30 seconds) but sometimes the Dual Boot did not work, starting immediately with Windows 10 Pro. Through EasyBCD I created a new BCDEDIT (Windows 7 VHD default - Delay: Waiting for the user's choice) but even now sometimes the Dual Boot does not work, and immediately starts Windows 10 Pro. Any idea ?