@teotjunk - "...best reader in Windows for epub?" is a subjective judgement, but FWIW I like the Calibre Viewer best of all - but its quite far from my 'dream reader'.
If the problems with installing ADE on your Office Laptop relate to Corporate IT lockdown policies then you'd probably have the same problems with the alternatives such Calibre or Sumatra etc.
If you can install browser extensions you could try one of the in-browser EPUB Readers such as Readium or EPUBReader.
BR
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