• First thing first.please provide us the error message logged in the setup log files which are located in %programfiles%\Microsoft SQL Server\100\Setup Bootstrap\Log\.

    another thing .. try to install on other disk/drive . see http://community.spiceworks.com/topic/96872-solved-error-0x80070057-trying-to-install-server-2008

    -------Bhuvnesh----------
    I work only to learn Sql Server...though my company pays me for getting their stuff done;-)