Possible Security Issues with Quicktime?

Hi all,
I keep a pretty close security watch on my computer and what is happening in the background. I have Norton NAV2008 and Spy Sweeper running and I am always going into Norton to see what the activity list has to say.
Quicktime (qttask.exe) makes frequent and large changes to my Windows start-up files through modification of the registry settings.
I do not like to see programs making these changes, as most malware and worms do this type of thing.
Is this normal activity for Quick Time or should I be worried here?

Ken,
Thanks for answering. Norton just reports the activity as "qttask.exe has made 79 changes to your Windows Start up Files". It gives it a low priority and didn't come up as a "pop up" that required action. It seems like it knows that Quicktime is a program that sometimes does this and it is just reporting it as such.
As I said, I have no idea whether QT does these changes on a regular basis as part of its program, hence my question here. Yes, QT is used by Itunes and that is what I exclusively use it for. Itunes doesn't work without it apparently, as I noticed the file manipulation and previously removed Quicktime. Then when I tried to use Itunes, it squawked and said QT wan't installed.
Thanks again for the reply.

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