I have and ATI graphics card and I just downloaded and installed the latestes drivers from their site. There's another thread somewhere dealing with ATI graphics card where I posted a link that will allow you to get the updated driver from the site.

Don't upgrade the driver from Windows 7 go to the actual site and download the graphics suite for your graphics card.  That should fix any problems.  If you have already done this then I don't know what to tell you.  I have Poser Pro 2010 and the upgraded graphic suite that I downloaded and installed from the site solved all of my ATI graphics problems that I know of as it relates to Poser Pro 3020 without the service releases.  I have yet to install the SR for Poser Pro.