Found the error, in my code, this is the problem with testing on the machine it was built on,
The app was looking for a file which i (Stupidly) forgot to include in the installer, and as such, it crashed and takes down WMP as parts of my app use the MP 4 core, strangly so does the latest MP.
making new installer now.
--EDIT--
New installer made with fix included, you might need to re-install media player, i don't think so though as i have included the most recent core available core with my installer.
Just waiting for it to be hosted.
Sorry for any inconvience this has caused.