Capturing a video from a webcam using Visual Basic 2005

Hi,

Okay i know this question has been posted too many times, but no matter how many forums i check out i can never get the right answer! :( So, here it is again. I'm using a picturebox to display the video captured from my webcam. I tried the code from this article:

http://www.devx.com/dotnet/Article/30375/1763

Works fine the first time, but the second time i run the code it asks me for the video source as shown in the screenshot attached, but it does not show me any video.
I 'm not sure where its going wrong. My guess from my limited knowledge is that something has to be disposed when the form is closed, as the codes do not work unless i reboot my computer.Please help me out. Thanks a bunch!