Do not plug in the ELM327 yet!
Download and install the drivers from our LINKS page or follow the guide here: http://www.totalcardiagnostics.com/support/Knowledgebase/Article/View/1/0/how-to-install-elm327-usb-cable-on-windows-and-obd2-software
Now you can plug in your modified ELM327...
Setting up with ELMCONFIG:
If your ELM327 has a Prolific or Silicon Labs USB chipset, select VCP Driver.
If you have FTDI, select FTDI D2XX.
Elmconfig will now close.
Unplug the modified ELM327 from the USB, relaunch Elmconfig and plug the ELM327 back into the same USB port.
If you wish to change the speed back to 38400 for software that does not support faster baud rates such as EasyOBD, follow this guide but enter 500000 as the port speed, complete the speed test then enter 38400 as the new speed.