I'm new to the forum because I'm trying to find a solution for Calibre not opening. I was using Calibre 3.34.0 and received an Error 3 message. System can't find pathway u'G: etc. Using Windows 10. I uninstalled Calibre and reinstalled 3.39.1. I'm not getting the error message anymore but absolutely nothing happens when I try to open it. I've been using Calibre for years and transferred my files to a new computer 3 months ago and now suddenly have problems. Thanks in advance!