Download and install the commerical Excel plug-in Crystal Ball by Oracle. Most students will need the 32 bit version. If you are using 64 bit Excel, you'll need to install the 64 bit version.
Register the software with the username WFU-labs@WFU.edu
and the serial number 5593BCFF-68A1D993-378B2363-BD1B47C0
Note that the software only works on Windows.