You need to add it under Dependency Tasks. Currently the task says, "Kill the apps, then check for iTunes, if it isn't found, install everything it needs, then with iTunes now being installed, kill all apps."
Put it underneath by clicking 'Dependency Tasks' and clicking 'Add > Task' so that it reads:
iTunes
.....Dependency Tasks
.........Pre-task App Kills
.........Mobile Device
.........Apple Application Support
.........Bonjour
.........QuickTime
.........Post-task App Kills