Don't install newest driver or you might kill your graphics card. The official blizzard post here: http://starcraft.incgamers.com/blog/comments/nvidia-19675-drivers-starcraft-ii-beta-rip-pc-graphic-cards/
This is an important issue indeed, so I will repost here what have been posted on the battle.net forums:
We're getting reports where users are getting intermittent low FPS after installing these drivers. It seems that it is related to the fan control included in these drivers not working correctly and is causing the video card to overheat on 3D applications. This will affect Warcraft 3, World of Warcraft and StarCraft 2 Beta. Please uninstall the drivers and revert back to the older ones.