Help!! One Note with Crossover

I installed OneNote on my Mac with Crossover. It worked fine for a while, but now it refuses to let me open any of my OneNote files. It tells me, "Microsoft OneNote has not been installed for the current user. Please run setup to install the application." I have tried everything that I can think of to try to recover these files, but, then again, I do not know much about computers. Can anyone help?

Thanks,
Hoof