..you run the program. Two steps will prevent it from running normally at start up. First, open the Control Panel, then double click on the "Quicktime" icon, (the blue "Q"). When that opens, click on the "Advanced" tab, then UNCHECK the box that says: "Install Quicktime icon in system tray", then click on "apply", then OK.
Next, uncheck the "Qttask.exe" box in the "Msconfig/Startup tab" location. Restarting the computer will stop Quicktime from being started at boot.
Still, as I stated in the subject line of this poste, once you run Quicktime again, the CHECK mark in "msconfig" will be replaced and it will run again at start up. As far as I'm aware, there is no way to fix that. I've even removed the registry enty from the "Run" call..After using Quicktime again, it's replaced and the program runs at start up.
Hope this helps.