Run silent installation commands on Windows Vista, Windows 2008, and Windows 7
By default, the IBMIM command is set to run in administrator mode. However, the IBMIMc command, used to install silently, does not run in administrator mode. For silent installations of IBM Installation Manager, open the command prompt using the Run as administrator option.
Right-click the IBMIMc command prompt icon (cmd) and select...
Run as administrator
Enter an administrator password when prompted for either an administrator password or a confirmation.