I had to reinstall my PC and now I can not open my ebooks in Adobe Digital Editions.
IO Error on local file open
C:\Users\kaisas\Documents\My Digital Editions\Continual_service_improvement_2011_PDF.pdf
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Does that file exist - with that error, the file no longer exists, or ADE doesn't have permssions to read it (which would be wierd since it's in you Documents directory).
That just shows that ADE still thinks that they are around. If you look at the info dialog, that will show where ADE thinks they are on your computer, and you can use Explorer to go see if they are still there.