Oftentimes between the settings in Windows and the keyboard, the “-” key on the numeric keypad does not work correctly in the WiPS Quickstep graphical user interface. For ease of data entry you would like it to work the same as the minus key next to the zero. This is relatively easy to fix but does require downloading an application to help remap your keyboard. Below is a short video showing how to download and run the KeyTweak application
Link to the application: http://webpages.charter.net/krumsick/
Some additional information: http://lifehacker.com/159434/download-of-the-day-keytweak