I have a Samsung 256gb SSD, and a 1.5tb HDD. There is too much important info on the HDD to delete, have no drive large enough to save it with, and just want to upgrade from Win7 to Win8.1 . I am knowledgeable about computers, but am very inexperienced with bios and os and the such. I built the computer myself, and am confident with moving components in and out.