Forgive me if this is not of any help, I am very new to Astronomy but do happen to know a thing about computers, try this site:
http://rsb.info.nih.gov/ij/plugins/avi-reader.html, if that does not work you could also try:
http://www.giveawayoftheday.com/free...i/decompressor, let me know how you go with that,
Cheers
Nick