CrossOver issues this warning if it detected an outdated graphics driver on your system which is known to have bugs that prevent the proper execution of 3D applications. Old NVIDIA drivers are known to cause problems with Half-Life, Source engine games and World of Warcraft in addition to having generally lower performance. Please consult your operating system's documentation for details on how to upgrade your driver, or how to download a driver from your graphics card vendor's website.
If you do not plan to run games or multimedia applications you can ignore this warning.
Graphics drivers are available as normal Mac OS X system updates. Please install all available updates. Old drivers often cause performance problems or crashes.
Distributions often ship drivers with their update system. Drivers for NVIDIA cards are also available from http://www.nvidia.com.