I got mine to work finally. What ended up working was that I went into
the default program menus and set a different program as default
(powerDVD i think), then set it as the default program for .avi, .mpg,
and .mpeg. Then I saved those settings and rebooted the system. On
reboot, I went in and reset Windows Media Player as the default player,
and reset it as the default for.avi, .mpg, and .mpeg, then saved these
settings and rebooted again. After the reboot it worked fine.
I don't know why I had to change the settings to something else, and
then back again, because the settings I ended up with were the excact
same as I started with, but I guess whatever needed reset got reset.
Thanks for the help though!