Screen Capture it's norm called. It usually works bu selecting the area of the screen you want to capture and saving it as an AVI file.
Try www.downloads.com Full of shareware and demos of this kind of thing.
Try Hyper Cam. Seems the most populare of this kind of software on downloads.com. Demo saves with a watermark though.
http://download.cnet.com/HyperCam/30...html?tag=mncol
Bookmarks