Zloth
I smell a... wumpus!?
If you've still got this old beast, it looks like it's time to remove it. It's got some hacking problems and Apple isn't interested in fixing up such old software.
http://www.pcgamer.com/windows-users-should-uninstall-quicktime-immediately-trend-micro-warns/
http://www.pcgamer.com/windows-users-should-uninstall-quicktime-immediately-trend-micro-warns/