Macbook pro cannot open .avi files

I have just bought this Macbook Pro and have found that Quicktime cannot open either .avi or mp4 videos. I downloaded RealPlayer for Mac - it plays .avi video sound but shows no picture. What can I do to correct these faults?

Get VLC http://www.videolan.org/vlc/download-macosx.html the intel based 64 bit one.

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Cannot open .avi files imported from Nikon d90 in Adobe Premiere 6.0.

Cannot open .avi files imported from Nikon d90 in Adobe Premiere 6.0.
When I try to open the file I get the following error message:
"cannot open that file
the file uses an unsupported file compression format"
I really need urgent help with this so if you know a soloution, please post it!

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After you search the forum and find the (I think free) codec vendors, you will need to install fresh so Premiere will "see" the codec for editing
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convert mjpeg avi
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If you plan to do much video work, you need a tape-based DV camcorder so you use Firewire to do a digital transfer as a "real" AVI that Premiere may edit without conversion or extra software
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http://reviews.cnet.com/Panasonic_PV_GS320/4505-6500_7-32330317.html
http://reviews.cnet.com/digital-camcorders/panasonic-pv-gs500/4505-6500_7-31660646.html

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Desperately need help! I am new to video editing and I am having a tough time editing my videos (which are in AVI format coming from my Nikon P5100 digital compact camera) in Adobe Premiere Elements 9.
The Organiser recognizes the AVI files and plays them OK.
However when I drag them to the editing window in Premiere Elements, I get a pop up window entitled "Generic Failure" and the message is "This type of file is not supported, or the required codec is not installed."
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Thanks for help!
regards,
Ali

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What CODEC is used in the Nikon AVI files?
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Back up all data.
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~/Library/Internet Plug-ins
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The document "2147483647-11-06 06_00_00.FinalCutCopy" could not be opened. Final Cut Pro cannot open files of this type.

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Macbook pro cannot open .avi files

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