Bought the game three days ago, played 4 hours so far without problems.
Since this morning the actual game won't load, I can choose to go on or restart the mission, but the best result I can get is the mission's loading symbol followed by the crash with the windows message.
Haven't installed anything since the installation nor changed anything.
OS: Win 7 pro (64bit)
CPU: i7 2.8GHz
ati 5700 series (driver is up to date)