Open the ua guide, in intermediate, in applications, in that menu, there are names of well used installers, e.g. inno setup, nsis, windows installer and installshield. Click them to know how to identify what installer is used. PeerGuardian2 uses inno setup, so the switches are /VERYSILENT /SP- It's all there. You can even add stuff to the database and edit it. http://unattended.msfn.org/unattended.xp/admin/ You don't have to be admin, u can be a normal user, just the url has admin in it. And here for adding switches: http://unattended.msfn.org/unattended.xp/page/add/switch/