That is the exact same error I had... i wrote a long post and it dissappeared, but I am up and running, here is the gist, (minus all the things I tried that did not work!)
My http://www.genius-europe.com/en/produktdetail.php?ID2=51&ID=27&ID3=506
are my pedals for simming.
Lock-on does not want to work with this device in the system.
I tried joystick, no pedals, works.
Pedals nothing else, does not work.
I tried moving the USB ports... but.. if this device is plugged in, FC2 will not boot. If I take it out, it boots consistantly. I can use the twist on my stick... but would much rather my feet...
Thank you for the helping... any ideas how to reach perfection!