Taking photo in low light environment like indoors, cloudy shade, etc.). or when photographing a moving subject even with your lens aperture open widest every shot you take is a blurred.

Try this: Simply increase the ISO. If it is set to 100, bump it up to 400. If you are already at 400, try 1600.

By increasing the ISO, you increase the speed that the sensor absorbs light — this in turn increases your shutter speed. Faster shutter speeds freeze subject motion, providing you with sharp photos.