PTC creo 3 student edition not wanting license

I managed to install Creo 3 a month ago using this method: Creo Installation Guide for Students and it worked, but then I replaced the motherboard and then Creo no longer worked. So I tried to reinstall it (using the school setup), and it does the same thing, but no longer asks for my license in the installation stage. After it installs it says that I need a license.