What version of Windows are you using ? apparently what i manged to find on web if you are using x64 bit. windows you will need any x64 bit version codecs. And for my own opinion i just think you should try converting your .Avi to .WMV I will post a few links that might actually help you.

forums.creativecow.net/thread/24/927930

tech-faq.com/how-to-convert-avi-to-wmv.html