Lenovo k450 with windows 8.1, old PC dell xps400 with windows 7 ultimate from upgrade. Upon installing the old ata 5400rpm HD to the new pc, how do i configure to dual boot. I have Photoshop cs2 (yeah its old i know) on the old dell and i am not purchasing PS upgrade for a few months. I read something about installing win 7 first but the are already on 2 hard drives. thanks a million as always!!