I wish to run a window application from labview... wait until it finishes its activity (it will close itself) and then, only after it finished, the VI will continue...
On your block diagram, look in the functions palette - Communications - System Exec. You can wire a DOS command line (string constant) to start any windows program into the function. One of the terminals is a boolean to wait until the called application is complete. Look up help for System Exec for more details.