I have a laptop with Win XP on it. I downloaded priidash and ran the priidash3mfd.exe program. It did not work so I followed some additional steps. 1. I uninstalled the existing driver I had on the COM port where the ELM device was connected through USB. 2. I used Windows driver auto install to install a driver for that. Looks like COM4. 3. I used the baud setting tool to set the baud rate to 500000, the max the device seems to handle. I then tested it like the forum post said by sending some commands to it at 500000. Got legible responses. 4. I closed that baud setter and ran the priidash executable. 5. In the second text box, I put \\.\COM4 and then 500k. When I press GO, it just toggles from green to red, then to green again if I click it again. Gauges do not populate. I know the ELM works because I could connect to the Prius with another program to clear a code.