"The From Scanner or Camera option is not available, even though my scanner/camera is plugged in."
The From Scanner or Camera option may not be available, even though you have installed and connected a scanner/camera, if it does not support Windows Image Acquisition (WIA). If your scanner/camera supports a different image acquisition system, e.g. TWAIN, create a .PNG or .JPG file of the image in My Pictures, and load it from there.