In the Printer Driver preferences, the Device Settings tab has a Restore Defaults button on the bottom which allows the default settings for the driver to be restored. The Printer Driver will restore the default settings from the INI file.

Location for the INI files on On 64 bit Operating Systems;
c:\Windows\System32\spool\drivers\x64\3\
c:\Windows\System32\spool\drivers\x64\
Location for the INI files on On 32 bit Operating Systems;
c:\Windows\System32\spool\drivers\w32x86\3\
c:\Windows\System32\spool\drivers\w32x86\
Licensed Printer Driver INI file names;
ColorPlus driver BuAiniNT.ini
TIFF (monochrome) driver BuMIniNT.ini
PDF driver BuPIniNT.ini
ColorPlus Terminal Server driver BuAIniTS.ini
TIFF Terminal Server driver BuMIniTS.ini
PDF Terminal Server driver BuPIniTS.ini
ColorPlus X1 driver BuAiniNT.ini
TIFF (monochrome) X1 driver BuMIniNT.ini
PDF X1 driver BuPIniNT.ini
ColorPlus X1 Terminal Server driver BuAIniTS.ini
TIFF X1 Terminal Server driver BuMIniTS.ini
PDF X1 Terminal Server driver BuPIniTS.ini