unattended installation of winxp onto a win2000 system

we are copying the i386 onto a system and use winnt32 with an unattend.txt
file that specifies not to upgrade but make a clean xp install to c:\winnt
and therefore delete the win2000 fully unatteded. but in textmode the setup
is still asking to press a specific key to confirm if we realy want to delete
the win2000 installation in c:\winnt. i would expect a "fully unattended"
installation not to ask. Is there anyworkaround?

thanks in advance