Why does your euro truck simulator not start?

Normally it does start once you've finished downloading it.If it doesn't start for you,it means maybe theres something wrong with the game.Another reason is that if you've bought it in a shop or online,You'll need a kind of thing that allows you to play 3D games on your computer.Then you'll be able to play 3D games like Driving Simulator 2011 and 18 Wheels of Steel Extreme Trucker.To find out what it is,just go to Wikipedia.