Do you have any application window that should not be closed? Also, you do not want it to be minimized on task bar to prevent viewing or closure of that application window by other users. TrayTask is a simple utility that cleans up your taskbar and pins any app window from taskbar to system tray.
It does not require installation, just download and unzip to start using it. It sits on system tray, you can right click on TrayTask icon to send any active from taskbar to system tray. You can uncheck any application window and make it visible again on taskbar. Download TrayTask [weblink] to keep your opened application windows safe from getting closed and clean up the taskbar area.