We bought Samsung NP900X4C-A02SE, it came with preinstalled Windows 8. We are trying to install Windows 7 on it, but W7 installation cannot find the SSD drive on the laptop. We needed to disable UEFI and Secureboot to get W7 installation started, but not that it starts, it can't find the disc. And I cannot find any drivers to this laptop for storage that can be given on installation. Tried to disable AHCI also, same results. How to get W7 for this model?