About 2 weeks or so ago, my midis played just fine. Then about 5 days ago they suddenly stopped playing. The media player says its playing but no sound is comming from the speakers..

What could be wrong?

Did you go into Options > Preferences and check to see if sounds were off?
In response to Crashed
Anyother sounds?
In response to ADT_CLONE
Yes, my media player will play everything but .mids and .midis, and it only happened recently.
In response to Dark Krow
Either the synthesizer for midis with your computer is completely buggered, or you've turned down midi sound. There is, as far as I'm aware, a seperate volume control for midi stuff and regular stuff. If you have that loudspeaker icon in your control panel (Next to the time), or another volume control there, doubleclick it and check the position of the sliders, and check that none of the catagories are muted.