Show Mouse script fails because Rasterizer not found.

So in the interest of making a physics based game, I need to have the mouse viewable so as to allow to user access menus in game. This is proving to be quite a difficult task, as I cant seem to find why the Rasterizer module isn’t being detected. As a matter of troubleshooting, I downloaded a .blend file that used a mouselook script - it also uses the Rasterizer module - and it was working. A friend of mine had the same issue. He could use the mouselook feature of another .blend file, but if he copied the script into his own project, it wouldn’t work.

I am using Python v 2.6.1 and Blender v 2.49 on Windows XP Service Pack 2.

I am very sorry if this is a very common question.

Thanks in advance.