Can't install Comodo Firewall

Hello,everybody ;D
I’ve just install Avira Free Antivirus 2012,then install Comodo Firewall,but it seems to be wrong somewhere,the fact is that I can’t install Comodo Firewall,I mean when it comes to the second step that indicate the language option,the window of installing is just disappeared somehow,but I can still find its processes in task manager.By the way, it’s my first time to post here,anyone can help me ?Thanks :-TU

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I’ve figured it out,it was influenced by an optimization software,thanks all the same. ;D

What optimization software are you using? That would be interesting to know.