To restore the factory or installation settings of ARES Commander you can rename or remove the following user settings folder under:
Location under Windows Vista, 7, 8, 8.1 and 10:
c:\Users\[User name]\AppData\Roaming\ARES Commander Edition
For the 64-Bit Version of ARES:
c:\Users\[User name]\AppData\Roaming\ARES Commander Edition x64
Location under Windows XP (obsolete, not supported with newer ARES Commander versions anymore):
c:\Documents and Settings\[User name]\Application Data\ARES Commander Edition
ARES Commander shouldn't run during the renaming or removing process of the user settings folder.
The display of AppData folder is hidden in Windows system defaults. You can change it in the Windows Explorer via the Menu Tools->Folder Options...->Tab View and the list box advanced settings.
By typing %appdata% into the address bar of the Windows Explorer and pressing the Return/Enter-key, you can directly open your User-Roaming-folder.