I know you've mentioned it doesn't play AVI files, does it play any other media? I.e. Audio CDs?
Download VLC player for FREE! from:
http://www.videolan.org/vlc/
If it then plays, then WMP is missing a Video Codec for AVI files.
More info on WMP and it's file formats are available here:
http://support.microsoft.com/kb/234019
If WMP isn't showing up, go into start - control panal and uninstall WMP from Add / Remove programs and then reinstall it via Windows Updates or from MS.com
http://www.microsoft.com/windows/win...1/default.aspx
Hope this helps
Kev
__________________
Toshiba Accredited Laptop Technician
Big world out there - softwaretipsandtricks have your answer
www.google.com is your friend

Happy to help with Windows 95, 98, ME, XP & Vista. Any router issues are also welcome