I agree with JohnWein, you need to decrease the image size.
To resize an image, you can load it to a Bitmap, then create a smalled Bitmap and create a graphics to draw the old image onto this new Bitmap. Below thread shows the detail: http://social.msdn.microsoft.com/Forums/en-US/Vsexpressvb/thread/6924a2ad-b111-4b0a-afc6-d6cbe40f1c50
Please mark the replies as answers if they help and unmark if they don't. This can be beneficial to other community members reading the thread.