I have reinstalled windows in this manner. It replaced files that were possibly corrupted or that have been overwritten and were incompatible versions. I did not overwrite redundant files or drivers from devices that have been removed so I did not remove any conflicts it might have. It was essential that I made a backup of my files! I used a 'windows boot disk' to restart my PC. Then I reinstalled windows from a Microsoft Windows 98 2nd Edition CD. It might tell me it has found a file that is newer than the one it is about to install. I kept the newer files when I was prompted! If this did not help clear up my problem after I had finished the reinstalation I would repeat the reinstalation process then when asked do I want to replace the newer files I would say no. I have done this on my system and it has not removed any of my business files. This way just overlays windows files on top of my existing files. PS. I """Avoided""" "FDISK" + "Formating" these would wipe out my system clean!