Windows 7 Counter-Strike Source trouble

I have a problem with my Counter-Strike Source. When i enter the game from my steam account, my modem (Thomson Alcatel Speedtouch Router) crashes. I hate this issue and i want to get rid of it. Can someone help ?:(

Edit:When i doubleclick the "Counter strike -source "Game at My games in STEAM my modem crashes. Any help ? Please:(

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