If you havent backed up theres a good chance you have lost your files. However, I lost everything once on my old P(XP) and hadnt created a back up. I took it to PC World and they placed the PC on another PC and made it a slave so the files were restored. They usaully charge for this but I sweet talked them round as I had paid over £300 for an insurnace plan, (which doesnt cover software though) hence, important to create back up. Im no expert at all so maybe someone else to explain the slave procedure to you.