well make sure you press esp or right click and save, don't rely on autosave. They usually disappear if you don't save using the menu. If you keep having trouble, then uninstall the game and reinstall it using 7zip to extract it. If you don't know what 7zip is, then Google and download it, and install it, it is basically an extraction for games which may be why you can't save since 7zip extract special game- type files