Opening .avi file in QT & getting "some necessary QT software is missing"

Firstly, I don't know alot about Mac or QT as I've never used one until I bought my MacBook about a month ago. So forgive me if this is a stupid question!
When I try to open a .avi file in QT, I get the following message:
"Some necessary QuickTime software is missing. It may be available on the QuickTime Web site. If you have a dialup connection to the internet, make sure it is active, then click the Continue button to check for the software."
I'm using wireless broadand, not dialup, but anyway I click on Continue and it takes me to this Web site:
http://www.apple.com/quicktime/resources/components.html
From there I don't know what to do. The error message of "some necessary QT software is missing" is really vague to me, so I am lost when it comes to that Components page and I don't know what to do.
I am using OS X and I have checked for any up software updates and there are none.
Can someone please tell me what I should do?! Thanks!

ok nevermind, I discovered the Seach feature of this site and got the file to open in VLC.
Sorry!

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Thanks Curt and 'Mylenium'
I did re-set the prefs - but to no avail
I checked and my graphics driver and audio is all up to date.
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