You can find bunches of posts for 2343 errors. Lots of voodoo to fix them. Not clear any of it works. Most of it looks like more trouble than iCloud for Windows is worth.
I had one machine update fine. Other is throwing 2343 for update/repair/uninstall/new install. Only major difference I can think of is the problem machine has Office2016 preview including Outlook.
I have found using iCloud sync features for anything besides files to cause *epic* problems of hundreds of duplicate bookmarks, chaos in contacts and calendar, etc. So I have all that set off. Moving stuff to my Mac via sneakernet better than how that worked.