Double clicking doesn't work well

I am using the following code to record screen while recording while using mouse to double click on some item like double click ppt to open it in PowerPoint, it is not very responsive. I have tried and it is much better when using the screen recorder feature of Windows Media Encoder 9. Any ideas what is wrong?

My environment: Windows Vista + Windows Media Encoder 9 + VSTS 2008 + C #. I have written the following code in the initialization code of a Windows Forms Application and I suspect there is something wrong with my Windows Forms Application?

My code,

IWMEncSourceGroup SrcGrp;
IWMEncSourceGroupCollection SrcGrpColl;
SrcGrpColl = encoder.SourceGroupCollection;
SrcGrp = (IWMEncSourceGroup)SrcGrpColl.Add("SG_1");

IWMEncVideoSource2 SrcVid;
IWMEncSource SrcAud;
SrcVid = (IWMEncVideoSource2)SrcGrp.AddSource(WMENC_SOURCE_TYPE.WMENC_VIDEO);
SrcAud = SrcGrp.AddSource(WMENC_SOURCE_TYPE.WMENC_AUDIO);

SrcVid.SetInput("ScreenCap://ScreenCapture1", "", "");
SrcAud.SetInput("Device://Default_Audio_Device", "", "");

// Specify a file object in which to save encoded content.
IWMEncFile File = encoder.File;
string CurrentFileName = Guid.NewGuid().ToString();
File.LocalFileName = CurrentFileName;
CurrentFileName = File.LocalFileName;

// Choose a profile from the collection.
IWMEncProfileCollection ProColl = encoder.ProfileCollection;
IWMEncProfile Pro;
for (int i = 0; i < ProColl.Count; i++)
{
    Pro = ProColl.Item(i);

    if (Pro.Name == "Screen Video/Audio High (CBR)")
    {
        SrcGrp.set_Profile(Pro);
        break;
    }
}
encoder.Start();

      

        
        
        
      

    

thanks in advance george