My OS is Windows XP Home Edition. Dell Dimension, desktop, one year old. When I run a program called Photofinish (which enhances photographs) the screen goes black for four seconds, then it returns, but the quality and definition of the colours and images is blurred. This is a recent problem when I try to run this program. What could be wrong? How can I correct it? (I have disabled all the startup programs - msconfig - but the problem remains.) I have changed the display settings, but this makes no difference. The problem remains.