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[tiernan]

I'm having the problem where when I start up Portal 2 It closes on the title screen. People on the internet say that to fix this you have to right click the game, click on properties, click on "Verify Integrity of Game Cache..." I did this 3 times. when its done, a window pops up saying "1 files failed to validate and will be reacquired." Does this mean the game didn't install correctly? Can someone tell me the problem and how i can fix it Please?