When you install an ICP pack on your Site Server , the Site Server version number gets incremented. When you want to install the R3 Prereq hotfix ( 977384 ), it checks to make sure it is not being installed on a ICP Site Server as there is no support
Read More...
Read the complete post at http://scug.be/blogs/sccm/archive/2010/10/19/configmgr-2007-r3-installing-hotfix-prerequisite-kb977384-on-a-site-server-with-icp-pack-will-fail.aspx