Why does quicktime 7 cause a reboot of windows xp when playing a .mov?

How come quicktime 6 works fine and plays my .mov files and allows me to transfer video from my digital camera whereas quicktime 7 causes a system reboot and i cant watch my videos? with quicktime 7 opening the folder containing the .mov or clicking on the .mov causes the screen to become black with blue characters on it that are not letters or numbers. then the bios screen comes up, eventually bringing me back to the desktop.
id be perfectly happy using quicktime 6 on my computer since it works great, however after i uninstalled quicktime 7 and reinstalled 6 i found out that i need quicktime 7 for my itunes. what do i do?
please help me.

that did not work, nor did changing quicktime into safe mod.
what is the difference between quicktime 6 and quicktime 7 such that 7 will cause windows to reboot after the weird black screen with blue nonsense (not letters or numbers) on it everytime i try to play an .mov file?
can i revert to a version of itunes that will allow me to used quicktime 6 without any negative effects to my current setup on itunes 7?
please help, this is very frustrating.

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