A while ago we reported to Ruud that Racer's support applications aren't displayed correctly under Win 7 64-bit with Aero enabled, as there was an obvious issue with the window order hiding input boxes. It turned out to be related to ordering problems with multiple OpenGL windows running simultaneously (ie. pacejka.exe counts as one, the pacejka graph, the input pop ups...). It worked fine when Aero was disabled though. Ruud found a solution that fixed that, at least for me running with Aero on, but it seems this is a case of one step forward one step back. If you can, try to enable Aero to see if it works at all - if that's not an option I suggest contacting Ruud again to let him know.