BB Flashback Express is a free screen recorder program for Windows which records screen activity, sound and webcam footage on demand. The output is saved as Flash or .avi and you get one click upload to YouTube as well as web page embedding et al.
Maximum performance - BB FlashBack Express uses different way of recording the screen than other screen recorder programs. It can produce high frame rate recordings with minimal impact on PC performance even on older PCs and netbooks. Smallest file sizes – Because it records only screen changes and uses a custom compression engine, native FBR format files give you fantastic quality movies, but at a tiny size.