Uhh... need more details man. What brand/make/model is it? Probably it's not going to work, I've never heard of bridging a USB to a serial port. If it didn't show up as one, I really don't think you can trick it into thinking it is. You can get USB to serial adapters, then just get a serial IR device, but that's beside the point, and probably retarded since you have serial ports on your MoBo.