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					Originally Posted by  theducks
					 
				 
				ebookreadr 
 
Something  odd is going on with your W7 install 
I have the exact same MSVCR QT5 modules as your error 
 
W7pro X64 
 
Look at your PATH and see if that got damaged (Sigil is not on the PATH) 
			
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ebookreadr - I would try uninstalling Sigil, deleting its preferences folder(normally at %LOCALAPPDATA%sigil-ebook) and removing all registry entries referring to Sigil.  And then do a reinstall and reset preferences.
btw : Sigil is not in PATH on my system. I normally start Sigil via Windows shell Open With, or Calibre Open With.  If I want to run it 'empty' I type 'Windows key, sigil, enter' 
BR