Hi all. I have a Dell desktop Inspiron 660, I5, Win 8, 2TB hard drive. I tried to install second hard drive or replaced original HD (2 TB) with a smaller (250 GB) but either cases the desktop does not recognized 2nd HD or new 250GB HD. I just want to remove 2TB HD and replace with 250GB HD and install Windows 7 (purchased from MS). Please, help. Thanks.