Answer: You have not yet activated your software. The software will run for two days in demo mode before a license is required. To activate your software:
1) You must either purchase a license (using the "Buy" button on the "About Marketing Engineering for Excel" dialog box) or use the License ID and Password supplied by your professor.
2) Click the "Activate" button under "About Marketing Engineering for Excel" (in the ME>XL menu in Excel) to enter your License ID and Password.
3) Click "Activate" and you should receive an "Action Complete" message.
4) Restart Excel.