How do I reinstall QuickTime X for Lion on MacBook Air

I accidentally moved QuickTime X to Trash and then emptied the Trash.  I'm now faced with most files gone and some still present in Trash because their properties are set to not allow it to be empited from Trash.  I tried going through and setting the properties to allow the files to be removed but to no success.  Can anyone help me remove the files left behind and reinstall QuickTime X.
PS...this is my first Apple computer.  Thanks.

If you don't have access to another Mac so that you can copy the QuickTime Player application, you'll need to reinstall Mac OS X.
As to the Trash problem, try restarting the Mac and emptying the Trash again.
Regards.

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