Is your computer 32bit or 64bit?  A 64bit system will often be unable to read an AVI which was compressed with a 32bit codec.

     Load the AVI into your video editor, then save a copy with a new name, using either another codec which works on your computer, or save an uncompressed version.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5