About a week ago, my CD/DVD drive stopped being recognized by my computer. I have a Sony VGN-N160G laptop computer. I have tried going under registry edit to delete the upper & lower filters, which hasn't worked. I have also tried doing that by downloading the programs found on this forum to do that (XP CD FIX). I even attempted recovering the C: drive to its factory settings under Sony Recovery. Whenever I put a disc in, it sounds like it is reading it, but it never does anything. The drive does not show up under the device manager at all. Please help me. I don't know what else to do. Thank you!