[protext] can't install protext because of md5 checksum mismatch.

[Karl Berry]

Hi Ahmet,

>    while i am trying to install ProTeXt-2.0.exe now it says :

I surmise that your download got corrupted somehow.  I suggest trying
http://tug.ctan.org/tex-archive/systems/win32/protext/ProTeXt-2.0.exe

Hope this helps ...
karl