Avi will run on any computer - there isn't any computer now that won't play an avi file. The problem is you may need a codec.
First, find a program known as "G-Spot". It's pretty cut and dried, you may not even need to install it, just download and run it. Use that program to "open" the offending file. G-Spot will tell you what codec you need and what you've got. (It's not really important that you understand the concept of a codec - just that you may need different ones to run different files.)
Once you know what codec you need, simply go to a reputable site like download.com and get that codec. Install, and you should be able to run that file.
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