My Microsoft One Note files seem to have lost some tabs since transitioning from 2007 to 2010

I was having problems with my Microsoft Office 2007. I was advised to reinstall it. I tried dozens of times and could not. So I installed Microsoft Office 2010. My one note files seem to have changed. When I open the One Note files......"I think are my old 2007 files" Nothing looks the same. Understandably it is a new version. However I cannot see the same tabs that were there before in 2007 now not in 2010. Is there something about One Note 2010 that changes the layout of the Pages and or Sections I am missing dozens of section tabs on the right hand side of the page.

Is there a way to find the original file from 2007 or is 2010 that different. Please advise. Thank you.
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if you see file names like "Open Notebook.onetoc2 " double click on that. If it opens it will show you the tabs as it had.
read here
where it states:
Notebooks are saved as folders, section groups are folders within the notebook folder, sections are .one files.  In OneNote, do File -> Open -> Open Notebook, and browse to the folder you found. That's all there is to it. Really!

OR here:

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RUA Volunteer2?Tableau Trainer & Consultant Sales Exec.Author Commented:
That cleared it up thank you.
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