coleen,
You're in luck, as that issue is an easy fix with one download. .WMV stand for windows media video, and is made for windows media player (on windows).
You just need to download a program called "flip4mac." There is a paid version, but there is also a free one (just google "flip4mac").
Download and install that program, then reboot your computer. Once it's installed the video should open in quicktime.
Let me know how that goes.