What are your system specs? What operating system are you running? 64 or 32 bit? Is there a crash log being output that you could provide? Have you made sure to disable all of your firewalls, including ones present on your modem/router/in your antivirus software? What kind of crash is it? Black screen then close, CTD, BSOD, lock up, etc? Are you on a laptop or desktop? If laptop, what's your system temp? Is your battery still good? Even if plugged in, a faulty battery can cause a system lock on more demanding games. Do you get an error message when you crash? If it's a BSOD, could you write down the STOP code and post it here? If it's a lockup, does ctrl+alt+delete circumvent the problem? How much ram are you using while trying to launch the game? What windows services do you have enabled? What SP are you running? Is your OS pirated, or have you activated it and installed Windows updates? Have you played around with your registry at all? Do you have similar problems on any other games? Any other information that you could provide, which you think could be helpful in diagnosing the issue at hand, would be helpful.
