I have deleted and re-installed arduino ide in an attempt to sort out some problems. When i open new install, config.h looks the same as it did before uninstalling. Can someone explain? I would like to start out fresh.
More information is needed for us to help you. What is config.h? I'd guess it's part of a sketch? If so, you need to download a fresh copy of the sketch from wherever you got it in the first place.
Config.h? running a sketch for a 3d printer? if you opened the sketch previously and then closed and saved changes, the sketch will save that config.h with the new config. As pert pointed out, you will likely need to re download the sketch , but first delete anything dealing with the old sketch.