Having wrecked both audio outputs on my computer, I plugged this device into a USB port and a message appeared saying not enough bandwidth available (because too much hardware was already in use, including a modem). My operating system is XP and the only remedy I've found so far is to start the computer without the modem connected, and then while a media player is operating, connect the modem. This procedure re-allocates the bandwidth. Not convenient but not the fault of the sound card - which works fine. Sound quality is less impressive than the internal sound card but good enough.