OpenCV program not connecting to webcam/Camera - c

Question

i am trying to learn about OpenCV and found a really good tutorial on youtube however, everytime i am told to "select a video device" on Visual Studio, a R6010 error pops up and i have to keep aborting the program. Here is the source code. I am using OpenCV 2.2, 2010 Visua Studio and the camera in question is a HP TrueVision HD. Thanks!
//tracker1
#include<opencv\cvaux.h>
#include<opencv\highgui.h>
#include<opencv\cxcore.h>
#include<stdio.h>
#include<stdlib.h>
int main(int argc, char* []){
CvSize size640x480 = cvSize(640, 480);
CvCapture* p_capWebCam; //assign a webcam (later)
IplImage* p_imgOriginal; //image given by the webcam
IplImage* p_imgProcessed; //webcam image processed
CvMemStorage* p_strStorage; //passing stored variables
CvSeq* p_seqCircles;
float* p_fltXYRadius; //3 points, 0 = X, 1 = Y, 2 = Radius
int i; //looping integer
char charCheckForEscKey;
p_capWebCam = cvCaptureFromCAM(0);
if(p_capWebCam == NULL){
printf("error, webcam not found");
getchar();
return(-1);
}
cvNamedWindow("original", CV_WINDOW_AUTOSIZE);
cvNamedWindow("processed", CV_WINDOW_AUTOSIZE);
p_imgProcessed = cvCreateImage(size640x480, IPL_DEPTH_8U, 1);
while(1){
p_imgOriginal = cvQueryFrame(p_capWebCam); //get frame of webcame
if(p_capWebCam == NULL){ //when the frame is not attained
printf("error, no frames were attained");
getchar();
break;
}
cvInRangeS(p_imgOriginal, CV_RGB(175,0,0), CV_RGB(256, 100, 100), p_imgProcessed);
p_strStorage = cvCreateMemStorage(0);
cvSmooth(p_imgProcessed, p_imgProcessed, CV_GAUSSIAN, 9 ,9);
p_seqCircles = cvHoughCircles(p_imgProcessed, p_strStorage, CV_HOUGH_GRADIENT, 2, p_imgProcessed->height/4, 100, 50, 10, 400);
for(i=0; i<p_seqCircles->total; i++){
p_fltXYRadius = (float*)cvGetSeqElem(p_seqCircles, i);
printf("ball position x = %f, y = %f, r = %f \n", p_fltXYRadius[0], p_fltXYRadius[1], p_fltXYRadius[2]);
cvCircle(p_imgOriginal, cvPoint(cvRound(p_fltXYRadius[0]), cvRound(p_fltXYRadius[1])), 3, CV_RGB(0, 255, 0), CV_FILLED);
cvCircle(p_imgOriginal, cvPoint(cvRound(p_fltXYRadius[0]), cvRound(p_fltXYRadius[1])), cvRound(p_fltXYRadius[2]), CV_RGB(255, 0, 0), 3);
}
cvShowImage("original", p_imgOriginal);
cvShowImage("processed", p_imgProcessed);
cvReleaseMemStorage(&p_strStorage);
charCheckForEscKey = cvWaitKey(10);
if(charCheckForEscKey == 27) break;
}
cvReleaseCapture(&p_capWebCam);
cvDestroyWindow("original");
cvDestroyWindow("processed");
}