Hi. I don’t know how this issue came to me !. But it is bother me.
When i press my Left Control key the other keys don’t working and there is something amazing to me that my W key and the directional arrows working. 
I saw this problem explained in one of stackoverflow’s game community and they believe its a bug that unity guys should fix it.
Thanks in advance and Please tell me what is the solution.
By the way, I’m using unity v 3.0.0