How to re-install Media Player

How can I re-install Media Player? Or at least some of the codecses which are messed up.

I've had problems on another PC with the codecs too, That would be nice since they are saying that media player does not need to be installed on Microsoft.com update

I found an interesting link which solved my problem here: http://www.winsupersite.com/showcase/win2k_removecomps.asp