Blurriness or distortion can be caused by dirty scanner glass, incorrect settings, or incorrectly placed documents. Also, if the scanner is not on a flat surface, that may lead the scanned image to be distorted. Cleaning the glass, adjusting settings, ensuring the document is flat and wrinkle-free, and moving the scanner to a flat surface can often resolve these issues. If not, you may have to return the scanner to the retailer or, if it's an old model, replace it.