Hi there, On Sun, 8 May 2016, Rajesh M wrote: > i am getting error this is not a valid win32 application. I suspect that you've downloaded the wrong archive. Does the .zip file that you downloaded say 'x86' somewhere in its name? Try https://www.isc.org/downloads/file/bind-9-10-4/?version=win-32-bit -- 73, Ged.