So i just finished building my new skylake build from switching from the AMD 6300 to the new Skylake I5, basically just used everything i already had besides my new CPU, MOBO, RAM. I used my older SSD and HDD from the prior build. My SSD had Windows 10 OS on it so when i booted up the new system with my SSD the new setup booted right up into Windows and everything like it was nothing. Just had to download my new drivers for my Gigabyte MOBO. Is this normal for it to boot right up without installing a brand new OS? Because i had also purchased a retail Windows 10 because i read that i need to start from scratch. Can anyone shed and light on this for me?