Everytime I start my computer QuickTime starts.
I hate that, I dont use QT and if Id like to then I can start it myself.
After looking in the options for it without any luck I found this tip online.
Be aware that changing settings in the registry is nothing that anyone should do, make sure you know what you do and be careful.
I wont be responsible for your actions, you are!
Start Regedit 
Go to HKLM,Software,Microsoft,Windows,CurrentVersion,Run 
Double-click Quick Time Task put semicolon in front of "C:\Program Files\QuickTime\qttask.exe" -atboottime 
OK 
Close Regedit
 
 