After installing Maverick, my downloaded movies will not play in Quick Time.  It gives me the following error "You can't open the application "QuickTime Player.app" because it may be damaged or incomplete."  What can I do?

After installing Maverick, my downloaded movies will not play in Quick Time.  I receive the following error message:
You can’t open the application “QuickTime Player.app” because it may be damaged or incomplete.  So I tried to unistall QT and I get an error that says, You can not delete this application as it is a requirement for the OSX.
Well I did find a way to delete it, by going into the various components and one by one deleting it.  Now I reinstall it and  the message is that this Quick Time is for an earlier version before Maverick 7.  SMH....Now what.?

Hello, terrygav. 
I would recommend processing a reinstall of Mavericks.
OS X Mavericks: Reinstall OS X
http://support.apple.com/kb/PH13871
Make sure to backup all of your data prior to reinstalling OS X 10.9.
Back up your Mac
http://support.apple.com/kb/PH11371
Cheers,
Jason H.

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    Hello, terrygav. 
    I would recommend processing a reinstall of Mavericks.
    OS X Mavericks: Reinstall OS X
    http://support.apple.com/kb/PH13871
    Make sure to backup all of your data prior to reinstalling OS X 10.9.
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    Cheers,
    Jason H.

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