Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Errors make this book nearly unuseable.

Some of the errors are typos but the majority are simply wrong. The author obviously has little real world hands on experience with DOS or Windows. It is far to simplistic to use for a serious study guide and the huge number of errors will seriously confuse a beginner. Don't waste your money on this book. You would be much better off to get copies of Windows 3.1 and DOS, install them, read the manuals, and the help files. To make matters worse, about one third of this book is dedicated to things that have nothing to do with the A+ Certification exam. At least it doesn't come with one of those lame cdroms that are filled with broken software. The "A+: Windows/DOS Study Guide" is junk. Don't waste your money.