Valid values:	poweruser, admin, or lowest
Default value:	admin

The effect of this directive depends on which version of Windows the user is running:

On Windows Vista and later:

This directive affects whether elevated rights are requested (via a User Account Control dialog) when the installation is started.

When set to admin (the default) or poweruser, Setup will always run with administrative privileges. If Setup was started by an unprivileged user, Windows will ask for the password to an account that has administrative privileges, and Setup will then run under that account.

When set to lowest, Setup will not request to be run with administrative privileges even if it was started by a member of the Administrators group. Additionally, the uninstall info root key will always be HKEY_CURRENT_USER, and the "common" forms of the Shell Folder constants are mapped to the "user" forms, even if administrative privileges are available. Do not use this setting unless you are sure your installation will run successfully on unprivileged accounts.

On earlier versions of Windows:

This directive specifies the minimum user privileges required to run the installation.

When set to admin (the default), Setup will only run if the user is a member of the Administrators group. Otherwise, it will display the following message and exit: "You must be logged in as an administrator when installing this program."

When set to poweruser, Setup will only run if the user is a member of the Administrators or Power Users groups. Otherwise, it will display the following message and exit: "You must be logged in as an administrator or as a member of the Power Users group when installing this program."

When set to lowest Setup will not check the user's group membership. Additionally, the uninstall info root key will always be HKEY_CURRENT_USER, and the "common" forms of the Shell Folder constants are mapped to the "user" forms, even if administrative privileges are available. Do not use this setting unless you are sure your installation will run successfully on unprivileged accounts.

Note:

Regardless of the version of Windows, only if the installation is per-user (PrivilegesRequired=lowest) you may touch Windows' per-user areas from your script.