This past march i downloaded steam and bought modern warfare 2. It worked fine but after a while i got rid of it because i stopped playing it and just earlier i download it again but its not opening i get preparing to launch game then i see the mw2 background then it stops loading and goes away. Then when i start it from the desktop shortcut it will do the same but will give me a error saying "Steam Must Be Running To Play This Game" when it is open and running. If anyone can get this to work again like it did before i would be happy to +Rep!