Some questions to clarify your problem. Most of these are scavenged from these forums, so you might try searching through them to see if any are similar to yours.
Which version of the game are you running? What OS are you playing on?
Does the crash have an error message either from the command prompt that may start with game or in a notification from the OS? (The first line or 2 of either would probably be sufficient)

You might also check to see if your graphics drivers are up-to-date or what version of openGL your graphics card supports, probably have to check the manufacturer's website.