I am at my wits end. I have uninstalled, reinstalled latest version; deleted all Apple stuff and installed 11.1.3 earlier version but get messages of missing .dlls. This has wasted my whole day trying to get iTunes back up and running but with no success. I am so annoyed at Apple for releasing a duff iTunes update. I cant image how many wasted hours there has been around the world.
I have followed so many suggestions but nothing seems to work.
Hopefully some bright spark at Apple reads these frustrated messages and advises all users how to fix the problem they created