How do I get Windows Media Player v9/v10 to show up in Mozilla v1.7.12?

I am using Windows XP Pro. SP2 and Mozilla v1.7.12 on two different 
computers.

At home, Mozilla uses Windows Media Player (WMP) v9 when playing back 
WMV files in Web pages (e.g., likes the ones on 
http://www.planetvids.com/). I also can fast forward once it gets enough 
buffers/feeds(?). At work, it looks like WMP v6.4 is playing and I 
cannot fast forward even when buffered/fed enough.

At first, I thought it was file type associations but that doesn't seem 
to change.

Thank you in advance. :)
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