My Macbook Pro won't allow me to update from Quicktime 10.2 to 10.7

I need QuickTime 7 on my mac to play some files for work, and already have QuickTime 10.2 on it, which my Mac won't allow me to uninstall. And when I try and install 7.7, I get an alert telling me that 'This version of QuickTime 7 can't be instralled on this disk because QuickTime X is already present. Please use Software Update to install the appropriate version of QuickTime for you Mac.'
Yet when I use Software Update, there is nothing to update.
Any ideas?

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Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode.
Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a Fusion Drive or a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of the test.

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AishaniKumar,
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I just checked the FAQs here and ran several searches and have not found an answer to my problem. I sure hope someone here can help.
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My Macbook Pro won't allow me to update from Quicktime 10.2 to 10.7

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