Windows operating system consists of many amazing features with the help of which you can complete your various purposes very easily. These features are very easy to use and very compatible with your tasks. But sometimes when you try to open an application for using its feature, you will see some error messages. Npptools.dll is missing error in Windows is also such type of error in the computer that comes to you due to the missing or corrupt Npptools.dll file. The error can harm the computer data very badly if not resolved at time. But you need not to be worry about. You can fix this issue with the help of the manual or automatic method properly. Using Advanced System Repair tool, you can resolve this problem automatically in your Windows OS.