A book of this size is never going to do much more than scratch the surface of problems that can occur with a computer, let alone the operating system and other systems software (device drivers, anti-virus software etc) running on it. To provide a thorough guide to solving PC problems would require something much, much thicker than this book. The question is, does this book provide enough information to solve the problem you have? In my case, the answer is no. My wife's computer started blue-screening today, even when attempting a safe boot. Did I work out what the problem was - yes. Was it a hardware problem - yes. Did this book guide me to the cause - no. I did follow the decision-making process in the book, but it didn't go half as far as was needed. The questions it asked were perfectly reasonable, just not comprehensive enough. If you need flowcharts to help you then you might want to use this book as a starting point, but be prepared to use something more comprehensive as well.