First off it may be an obvious answer but trying an ATi driver on an NVidia card will never work as far as I know

but, VGA, or probably more likely SVGA should at least get you somewhere on say an 800x600 @ 60Hz setting, it's the lowest i've managed to get on some really weird hardware configurations. Considering the Lenovo is pretty new it will probably take a fair amount of tweaking to get it working properly.
I suggest, you have a look at
Mandriva's Hardware Compatibility Database and look for certified IBM Laptops. Reason I say that is because the entries in their database for those machines come with a PDF file that has some hints about the on-board graphics on these machines, which are now being manufactured by Lenovo.
To get around that security shield you may be able to use a text based browser such as Lynx or Links on one of your free virtual consoles (ctrl+alt+F1,F2,F3,etc)
I believe these browsers should at least be included or installable from your cd/dvd.