How can one get the CARS PC game to work if it requires a GeForce or ATI video card and the laptop has an Intel 945GM express chipset

Many video games on the market require advance 3D processing to draw the game's elements onto the display. Most dedicated video cards can process game rendering many of orders of magnitudes faster than what a CPU would otherwise be capable of. With the integrated graphics, you don't have a dedicated video processor handling all of the advances processing, and most of it will fall back onto the CPU (the driver software handles the rendering instead of special hardware). In this case, you may have some options, but most likely not. You can try to update your video card drivers. If you can find a 3rd party driver that offers more software rendering support, that MAY work, but please be aware that installing 3rd party software means that you are taking a HUGE risk that the software is written properly, and that it is compatible with your system (for more people, I wouldn't even mention 3rd party drivers, but it was already in the answer, and I didnt' want to stomp on another person with my answer). Keep in mind though, that even if you do ge the game to "run" without a dedicated card, it will NEVER run as fast as it was supposed to...If a dedicated card would run that game on your system at 20-30 fps, software rendering will most likely run at less than 10 fps...practically unplayable for most people.