I was able to open OneNote on the day my pc upgraded to windows 10, but the next day I couldn't. I scratched my head, thinking what could of caused the issue, and the only thing I did on the day of installation was mess about with my accounts, changing back and forth from Local account to Microsoft account on my pc. Changing my account to how it was when I initially upgraded back didn't resolve the issue, then I thought what about system restore points. I restored my pc back to the day it was upgraded, and OneNote works again, all in sync.