It sounds like a codec problem.
Make sure you have the latest version on Windows Media Player and DivX. There are links on our support page.
If you are still having problems, look at AVIcodec in this thread:
https://forum.oneclickchicks.com/showthread.php?t=5218
It's a utility that will help you analyze what codecs a video requires and what your PC is missing.
Good Luck,