First, work through all of the steps here http://ppro.wikia.com/wiki/Troubleshooting
If your problem isn't fixed after you follow all of the steps, report back with the DETAILS asked for in the questions at the end of that link
I had a similar situation. My wife, the kids and I wanted to visit some friends in another town and I checked the car. It met minimum requirements, has four wheels, an engine, a trunk (for our luggage), a steering wheel, etcetera. Just like you.
Can anyone have an Idea of what is wrong? my pc meet all the requirements of Adobe CS4. Any help or suggestion will be much appreciated.
Whatever we tried, we were not able to visit those friends. Any help or suggestion will be much appreciated.
One tiny detail I left out: The car is a Dinky Toy.
Follow John's suggestion. This question is unanswerable without the tiny details like Dinky Toy.
Try checking your program monitor playback settings - is it set to "highest" and not "draft"?