The Problem: The Preferences folder has been corrupted.
The Error message: "There was a problem with your Preferences file. Try throwing it out and starting again"

The solution: Find this Simulation Curriculum folder and rename it.
Windows) \Users<YourUserName>\AppData\Local\Simulation Curriculum <--- rename it as "Simulation Curriculum1" Don't delete it. Just rename it.
Restart SN7.
Register again.
Does that fix it?
If you have important saved settings; i.e. equipment lists, location settings, etc, then these files will no longer be available in SN7 - until copied back from the renamed Simulation Curriculum. If you need assistance with this please submit a ticket with support.