17.1.3 Administrative Install
If running the installation with User Account Control (UAC) enabled, tasks which require administrator privileges include:
- Executing an installation
- Updating a local database
To perform an elevated installation, that is to install applications or patches using Windows Installer on behalf of a user who is not a member of the Administrators group, the installation must be started from a privileged command prompt.
If privileges are required to install an application, subsequent Windows Installer reinstallations, repairs or uninstalls of the application must also use elevated privileges.
For more information on UAC refer to relevant Microsoft documentation.
To access a command prompt with administrator rights, select option from the menu.
From the window execute the msiexec.exe command-line with the required parameters. For install, re-install and repair use the /I option. For uninstall use the /x option. If Programs & Features is used to uninstall then some directories and files will not be removed which may be removed manually (this will require elevation). All other changes to the system, for example to the registry, will still be backed out.
If the Windows Installer is executed under UAC but is not indicated as an Administrative install, the install will run as a installation preventing an install.