I don't know why it's doing this. It happens sometimes when I restart the computer. The transmitter is plugged into the extender base, which is just a USB extension cable. The extension cable is plugged into a PCI card that adds 4 USB ports to the computer. I also have my wireless gaming reciever for using my wireless xbox 360 controller to play PC games and my cell phone charger and my capture card plugged into this card and they all work great. I've tried reseating the connection by unplugging and plugging the transmitter from the extender and that's not working. I tred all the other USB ports on my computer (I have 12) and none of them are working with it. Most times I can simply unplug and replug a few times and it'll catch on, but I'd like to know if anyone else has this headset if you've had this problem? I have Windows Vista Ultimate 64 bit, by the way.