we have no antivirus on the PC- its strictly used only for the light show and we try to have only what is needed for that on the pc, I did have all wireless settings disabled, firewall setting was disabled as well, so I guess the only question left, is if it worked on all other computers without a crossover cable just by plugging it straight in with just an ethernet cable between the two, and the green light came on, without even trying to talk to the sequencing software, would that leave the last option open that they wired my ethernet port differently? So that is the last option left to try?