Alright. The blog was working in the original directory /Blog/ and to make the website more consistent I renamed the directory /blog/. Many hours later of trying to login, undo the change, erase and reinstall the software and even then move the new software back to the original directory - no success.
I've searched the help and the forum but the existing change directory topics are not relevent nor is the installation instructions.
So, I guess the only way to fix this mess is to get into the dashboard and hopefully then it is only to change the path there. If there's still more steps I may give up on WP.
So, since I get a 404 error for every file I try to open, how do I get WP to work?!!!