Media player in C#

Question

sir,madam
  i hv a project in C# to prepare media player. i recently format my pc. before i had windows XP,but nw i hv windows 7. previously my project is properly getting run. but nw a very few video and audio files are getting run in my project.it is giving "Exception  HRESULT 0x80040265". plzzzz help me to remove it.

thank you in advance.