Game Error

Okay, starting from today, I've gotten this unknown problem.

I've been playing Cross Fire for 2 months now without any problems or anything.
But, today morning I couldn't load the game, this is what happened;

I use GameBooster, so when it was up the Loading Reference or something, an error comes up saying "File was changed or forged, game is shut down by force".
I re downloaded it and it took me 2 hours again, and it worked. After, I closed it to go do my homework, I came back and the same problem.

I don't want to loose 2 hours of my time to download the same thing again and again.
Does someone have a solution for me?