Setup Creation Problem 'donetfx publisher not verified'

I want to create a setup, and include dotnetfx as part of my application and when any system need dotnexfx then it is installed otherwise just my application be installed, for that i practised alot but faced a problem which is

when i am creating setup or publising my application and Including prerequests (windows Installer and dotnetfx) during installation of dotnetfx i am encountring an error which is "the publisher of dotnetfx is not verified ", what i to do that setup dont give these type of errors and my setup do not download prerequest from vendor website

thanks




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Setup Creation Problem 'donetfx publisher not verified'