Why have my media players on my laptop stopped working?

[rhino]

I have MUSICMATCH and Windows Media Player which were working fine until about a week ago. When I try to play a media file or open a media player, there is no response at all.

 

[Hate M]

You're codecs are probably out of date, get K-Lite Codec pack, it's free.

 

[Die Tryin]

Brother has the same problem and its a real big Fault.