Missing Icons in ADE version 4.5.11 for Windows 10

Hi, I have ADE version 4.5.11, the icons under bookshelves are all missing, that is All Items,etc. This is where all the books I download from the local library are held. Therefore I cannot copy the files to my Kobo Cara HD reader. I have uninstalled & reinstalled many times and the problem is continually there.

Can anyone advise how to fix this problem, as until that time I cannot use the system.Thanks, Barry Ward