After a crash, post your complete game.log.txt to pastebin.com (no account needed) and then post the link here and we'll have a look for you (split the game.log.txt into multiple pastes if it is too big).
If pastebin is not available in your country please use
http://rentry.co and post the link to it here please. The page works like pastebin.
The file can be found at "C:\Users\*USERNAME*\Documents\Euro Truck Simulator 2" for a default install.