MSI Afterburner has a recording feature http://event.msi.com/vga/afterburner/download.htm
Its not the best thing for recording but it is the best you will get for free, and its not actually bad at all, it uses mjpeg compression which is not the best quality, other than that there is nothing wrong with it.
I have used it and am perfectly happy with it, another benefit with it is that you don't need supper fast HDD speeds.