How do I make a user level have admin rights during installation?

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I made an installer that works perfectly with XP. It works with Vista as well but only with administrators.

What if the user wants to install this software but doesn't have the administrator's password (user level at VISTA)? I have tried using the UAC plug in, but this would definitely prompt the user for the admin password.

Is there anyway that could make the installer run by the user as if he's the admin?

Please help... thanks...