Hi Sandi,
When you say you have the libraries for the USB keypad - do you have a DLL supplied and installed on your PC to control it?
If you have a DLL and an associated .h header file (and are running LabVIEW 8.5) - there is a wizard under the tools menu that will take those 2 files and create a set of 'wrapper' VIs which expose each of the functions in that DLL for you to use. Go to Tools - Import - Shared library (.dll) and follow the wizard steps.
You then need to look at the documentation for the DLL, figure out what each of the functions does and call the sub-VIs to achieve the right function.
If you don't have LabVIEW 8.5, you need to do this wrapping by hand, there is an old document which goes through this process step by step here:
You do need to look very carefully at the documentation for your DLL to make sure you set all the options right - it's easy to make a mistake. This document also goes through how to use CINs - it's quite tricky to use CINs so wherever possible I'd try and get hold of the DLL.
Hope this helps a bit! Good Luck,
Mark
Certified LabVIEW Architect