Vshost32.exe Stopped working...

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C#

I am converting a set of images into video using C# and i am using encoder for converting the images into video... and i am capturing images from a webcamera.

now capturing is working fine the problem coming is when i click on button for convert and it start executing the code block it comes an error that vshost32.exe has stop working..

my block code for that block is -->

string[] files = { };

foreach (string f in files)
{
     Debug.Print(f);
}
WMEncoder encoder = new WMEncoder();

try
{

    files = System.IO.Directory.GetFiles(@"C:\Users\gaurav.STRINGNET\Desktop\New folder\video capture\video capture\bin\Debug\img\");

}
catch (Exception ex)
{
     MessageBox.Show(ex.Message);
}

foreach (string f in files)
{
      Debug.Print(f);
}

 //profile for each frame
IWMEncProfile2 pro = new WMEncProfile2();

try
{
      pro.LoadFromFile(@"C:\Users\gaurav.STRINGNET\test.prx");
}
catch (Exception ex)
{
     MessageBox.Show(ex.Message, "error1");
}

//build up the collection of frames

IWMEncSourceGroup2 frameSourceGroup;

try
{
      foreach (string filename in files)
      {
           frameSourceGroup = (         IWMEncSourceGroup2)encoder.SourceGroupCollection.Add(filename);
           frameSourceGroup.set_Profile(pro);
           //odd to have to do it this way instead of via property

          IWMEncVideoSource2 sourceVideo = (IWMEncVideoSource2)frameSourceGroup.AddSource(WMENC_SOURCE_TYPE.WMENC_VIDEO);
          sourceVideo.SetInput(filename," ", " ");
      }
}
catch (Exception ex)
{
      MessageBox.Show(ex.Message, "error 2");
}

try
{
encoder.File.LocalFileName=
@"C:\Users\gaurav.STRINGNET\output.wmv";
encoder.PrepareToEncode(true);
}
catch (Exception ex)
{
    MessageBox.Show(ex.Message, "error 3");
}

//--------------

Kindly help me asap its urgent and i am using Windows 7 32-Bit OS with Visual Studio 2010 and i had already downloaded and installed the Windows Encoder library for Microsoft Website..
have a nice day .. Please help me asap