Carbon was correct in the fact that Computer Hope and the community on the forums cannot assist you with watching TV shows through Windows Media player. Yes, it's true that some file sharing sites (many out side of the United States) are still up and running. However, according to copyright laws watching TV shows over your computer is at this time considered illegal by the copyright holders (those producing the TV shows).
However, that being said, from the sounds of it. It does appear that you have some type of issue with WMP and if anyone has feedback or suggestions you're more than welcome to make them to help with getting Kreach3r's other media files working (not TV shows).
Many of the suggestions I'd offer it sounds like you've already tried. I can however, suggest the following things I'd try.
1. See if you can get media files to work in another player first on your computer. For example, try VLC or an alternative media player.
2. Try reinstalling the media codecs, I'd suggest a codec package like CCCP (
http://www.cccp-project.net/).