DivX in Safari

[iSam]

Been trying to watch some DivX vids online. But, when I try to view them, a box pops up and says that the video is not a DivX file. However, my friends who are on Vista say it works fine.

Any ideas?

 

[iSam]

I've tried it in Firefox as well. It's still not working. I think it might be the plug-in, have tried re-installing it but no joy.