System.IO.FileNotFoundException: Could not load file or assembly '***.dll

Question

Dear all,

I wrote a simple application build in .net framework version 4.0, there is reference a dll which is v1.1.4322, I dont think it should be a problem. however I get the error in run time :

System.IO.FileNotFoundException: Could not load file or assembly '***.dll' or one of its dependencies. The specified module could not be found. 

I am sure the the dll does reside with same folder of exe.

Framework version insalled: .net framework 4.0
exception dll runtime version :v1.1.4322
OS : Window 7 - 32 bit


I tried in other machine in same plateform that was working, 
but most of the machinese get such exception.

do you have any idea for that? I have tried almost 2 weeks with this error and going to crazy .. :(


Thank you!