I recently installed a cable modem for broadband internet (supplied by NTL). I was connecting at very poor speeds - a tec visited and said I had a problem with my USB coms with the modem, & suggested I fit an Ethernet PCI card which I did. I now have full speed broadband, but if I try to stream audio or video by PC locks up and restarts. This is sometimes happening at random as well for no reason. I am now finding that I can not play music or video offline using any of my media players (locking up after a few minuets) Any Ideas folks??