Yep, children go through different phases all the time!

Re upgrading, first, make sure you key in the license key.
After that, putting the CD's in should auto-install the semesters. If not, you need to tell us what is happening, exactly. What did you do and what did you see?
If your computer is having trouble auto-running the CDs, then use My Computer to view the CDs and look for the Little Reader (.lrp) files and just double-click on them.
Alternatively, download them from your account and install directly.