iTunesHelper is an Apple utility that gets installed automatically when you install iTunes on your Windows computer. It keeps running in the background. You can view it in the Task Manager. Its job is to monitor the connection of your iPhone or iPod to your Windows computer. When you connect iPhone or iPod to your system, this utility automatically opens the iTunes app on your system. If you do not want it, you can uninstall it. The only impact of uninstalling the iTunesHelper is iTunes won't be launched automatically when you connect an Apple device to your system.