I have mac os 10.7.5 and my .mov file can not be opened

because the "file format can not be recognized."  How do I fix?

Thanks for responding.
I am still getting this message after trying what you suggested:
Before viewing PDF documents in this browser you must launch Adobe Reader and accept the End User License Agreement, then Quit and relaunch the browser.
I have downloaded  more than once: AdobeReaderInstaller_11_en_ltrosxd_amc_aih-1.dmg<http://aihdownload.adobe.com/bin/live/AdobeReaderInstaller_11_en_ltrosxd_amc_aih.dmg>  It never asks me to check the EULA
I have Safari 6.1 (7537.71)

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