What start and what step?
Stop 0x000008E in usbport.sys
If you get a 'blue screen of death' with this message, then you have successfully disregarded instructions so far, and your USB drivers have been updated without the fix being run. If you are getting a 'blue screen of death' with a different message than above, it is not from the FTDI USB drivers. Blame something else.
The V2.04.06 (or later) FTDI drivers must be uninstalled and replaced with older version FTDI drivers so that the driver fix can be run.
Unplug all non-vital USB devices.
Download the driver fix setup file here.
Run the setup file.
Run the FTDI driver clean utility (Start menu, 'Programs', 'Hondata', 'FTDI Driver Clean'). Select 'Clean System'.
Plug in the RomEditor4 cable. When prompted for USB drivers, select C:\Program Files\RomEditor4USBFix.
Run the driver fix utility (Start menu, 'Programs', 'Hondata', 'FTDI USB Driver Fix').
Repeat #6 for any other RomEditor4 cables.
Uninstall the driver fix utility (Start menu, 'Programs', 'Hondata', 'Uninstall FTDI Driver Fix').
Download and re-install RomEditor4.
Open the device manager.
Rick click on 'Hondata USB/Serial', and select 'Update Driver...'. If prompted, select the RomEditor4 installation directory for the drivers.