<P> The Execute phase happens in two steps: </P> <Ul> <Li> Immediate mode . In this phase, Windows Installer receives instructions, either from a user or an application, to install or uninstall features of a product . The requests cause the execution of sequences of actions, which query the installation database to build an internal script describing the execution phase in detail . </Li> <Li> Deferred mode . In this phase, the script built in immediate mode is executed in the context of the privileged Windows Installer service . The script must be executed by a privileged account because of the heterogeneity of the scenarios in which a setup operation is initiated . For example, elevated privileges are necessary to serve on - demand installation requests from non-privileged users . (To run with elevated privileges, however, the package must be deployed by a local administrator or advertised by a system administrator using Group Policy .) </Li> </Ul> <Li> Immediate mode . In this phase, Windows Installer receives instructions, either from a user or an application, to install or uninstall features of a product . The requests cause the execution of sequences of actions, which query the installation database to build an internal script describing the execution phase in detail . </Li> <Li> Deferred mode . In this phase, the script built in immediate mode is executed in the context of the privileged Windows Installer service . The script must be executed by a privileged account because of the heterogeneity of the scenarios in which a setup operation is initiated . For example, elevated privileges are necessary to serve on - demand installation requests from non-privileged users . (To run with elevated privileges, however, the package must be deployed by a local administrator or advertised by a system administrator using Group Policy .) </Li>

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