Muddy
I've also got the NexImage webcam, so I'm hopefully able to help.
You can update your version of registax to V3 via the toolbar at the top of the screen. Visit the Registax website and download for free.
I noticed in your screen capture image you have your auto exposure box checked. Uncheck it. That will give you control over shutter speed and gain, which will help you greatly when capturing those precious avis.
Good luck, and keep asking questions
