Cpuz is having a problem reading your board. Do you have the latest version of cpuz? In any case, I would try another version or a different monitoring software. Your voltage should be 1.0-1.1 volts. If you don't have any symptoms or problems with your system, I would not worry about it. Not all software is accurate for all motherboards. Don't open the case or fiddle with your board; this may void the warranty.