With upgrading my weather computer to Windows 7, I found out the Canon PowerShot A520 doesn’t work with the Willing Webcam software.  Though it is listed on the supported camera page, a second reading showed that it was only supported under Windows XP.  I did some further research and found out that Canon stopped adding the feature that allowed remote control of the PowerShot line via USB cable a few camera generations back.  I did find a possible alternative in something called CHDK.  CHDK is short for the Canon Hack Development Kit.  It is a technique to install an alternative firmware on a SD card and boot the camera to it. I had a newer Canon PowerShot SD780IS and gave it a shot.  I tested it with a different time-lapse software called VideoVelocity which supported CHDK.  Unfortunately, after all that configuration, it still didn’t work with either VideoVelocity or Willing Webcam.  So, I threw in the towel and went back to the Logitech C910.  It was fuzzy but worked under Windows 7 and Willing Webcam.