If SP2 isnt installed,try letting windows update do it,or at least get to the
point to where all other updates are installed except SP2,then try the cd or
download with SP2.Otherwise,chk event viewer for more details..
You receive a "Control ID not found" error message when you try to install Windows
XP Service Pack 2 or Windows XP Tablet PC Edition 2005 http://support.microsoft.com/kb/878472