I've been professionally involved in video for many years. Are you in Cyprus? I have pro equipment but I would need to know which AVI format (codec) you have used. If DV format, your clip will be about 11 minutes. I suspect, therefore, you have possibly used a more highly compressed format/codec.
To publish to the web, I would suggest you use WMV or Quicktime (WMV gives better quality for a given file size). You would need to know whether your viewers have broadband or DUN, as the degree of compression should be different.
I have a 10 minute Cyprus Government film I converted to WVM files at
http://www.cypenv.org/Files/video.htm in both formats. The broadband version may have hesitations of a few seconds when the Internet is busy. The DUN version (smaller pic) should stream faultlessly.