Graphics driver bug on MacBook Air late 2010

I saw a graphics driver bug on MacBook Air late 2010.
The problem is that some programs that uses graphics card will not display some drop down menu correctly.
For example this will happen on Windows Live messenger and Firefox 4 beta.
Problematic WLM screen shot: http://a-fung.net/files/scr1.png
Correct WLM screen shot: http://a-fung.net/files/scr1_correct.png
Problematic Firefox 4 beta screen shot: http://a-fung.net/files/scr2.png
It does not happen when I ran it in VMWare fusion or other machines. So I am sure this is a graphics driver problem.
Does anyone know how often Apple push driver updates?
Or does anyone know anyway to solve this problem?
BTW, I tried to force-install a later nvidia driver from the official website. The drop down problem goes away but I lose the ability to change screen brightness.

Hi Tom,
Thanks for your quick reply. I am not convinced it is a hardware problem. For if I hold the key that is faulty pressed for a few seconds it works, and the also works for a while before it stops working again. This to me seems like it is software based. Is there a secure way to test software vs. hardware e.g. by booting from an external image into a shell only? I do not think I have an image on a usb, is there any online server that I can connect to to try it?
Thanks again
Tobias

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