I bought an Advent webcam and had to take it back as it was so tempremental, the image would show and then not work etc etc. I have changed it for a Microsoft Livecam VX1000. I have installed it properly and everything seems to be working apart from I'm having exctly the same problem as the last one...every time I go to use the video - either to use the video alone or to use it with a friend on MSN or Skype - I just get a completely black screen. I have looked in the trobleshooting guide and follwed the instructions but to no avail. Does anyone have ANY idea why this is happening? I must have wasted hours trying to work it out and all I want to do is use the webcam! Could it be anything to do with the anti virus?