You will find Paint or Paintbrush in your Accessories Group open the paint program. Some programs just don't handle black and white bitmap graphics well. Software, video drivers and printer drivers, that are not keeping up with the new technology, can cause graphic problems. Bitmap Graphic abnormalities can some times be your first clue to an existing problem that you did not know you had or an upcoming hardware problem. Graphics are more memory sensitive then text is.
Graphics are also video sensitive.
You may have no problems with text, yet you can see video problems with the graphics. Some times both graphics and text are affected 1. We had a noisy CPU cooling fan causing graphic problems our computer. Dust bunnies in the computer can also cause graphic problems. Cigarette smoke can cause problems with the internal workings of your computer showing up in your graphics.