there are three options to save the HFS configuration,
by default the registry inside default key of \Software\rejetto\HFS (HKEY_LOCAL_MACHINE or HKEY_CURRENT_USER )
or inside hfs.ini in hfs folder
before reinstalling Windows, it's necessary to save the registry key \Software\rejetto\HFS to include it later in the new Windows, if you have not saved options in an ini file and not saved the registry key, then you have lose all