Have you tried to reinstall Windows Media Player plugin?

Yes I did, at first it identified it as already there, so it gave the option of repairing it, etc, so I uninstalled the Windows Media Player, then Installed it again, and it still doesn't seem to work! I have the same problem with several other plug ins, in the add ons and plug in section of Mozilla tools, I see that say, "incompatible with firefox 5.0" but as days go by those add-ons, that are built by those other websites seem to be repairing it, but I wanted to know for something as important as windows media player plug in, am I the only one getting this problem? :/

Ok this is going to sound a little dumb, but after shutting down my computer and turning it on this morning it worked, I guess all it needed was a reboot.....why didnt I think of that before :/