When I have complex models, I often get weird shading in my viewport.

Specifications: NVIDIA Quadro FX 3500

I do have drivers dating back from 2006, are there known issues with older drivers and Solidworks 2009 SP4.1?

Here is a screenshot:

http://img.photobucket.com/albums/v252/Kev_Boy/SolidWorks/Graphics_Issue.jpg

I would like to add that, doing a rebuild refreshes the screen and fixes it up almost always, however when I hover my mouse over geometry with the pre-selection highlighting or I rotate/pan around it goes back to trouble.