Para1. Yes. Find out which installer it uses and "search" preferably in the correct forum = "Application Switches" http://www.msfn.org/board/index.php?showforum=80 Or run the installer with the /? switch to see a list available. Also SEARCH the main website! http://unattended.msfn.org/xp/applications/innosetup.htm http://unattended.msfn.org/xp/applications/installshield.htm http://unattended.msfn.org/xp/applications/nsis.htm http://unattended.msfn.org/xp/applications/wininstall.htm http://unattended.msfn.org/xp/applications/wise.htm Para2. Search for your switches in correct forum. Para3. Yes they can all be reg this way, so get all your other stuff together first and then post back for reg help with some more details. No problem. Tell us all what you're using, RunOnce or Batch_file.cmd? Edit: not gone mad, must have posted simultaneously with Incroyable Hulk!