Newbie alert. I'm pretty sure I know how I did this, I just don't know how to undo it.
I was practicing a manual site migration by installing WP into a new folder on the same server, copying the 'old' wp-content files over to the 'new' wp-content folder and installing the php database on the server through the cpanel. It didn't look right so I started copying ALL the other files over into the new folder, including the wp-admin folder. Obviously a mistake, so now I want to just delete the new folder on the server but now my wp login and pw are the same for both sites (mysite and mysite/demo) and I'm afraid the sky will open up and my site will get struck by lightning (aka white screen of death) if I delete the new folder. Changing pw's doesn't work as it changes for both of them.
I'm hoping nothing will happen to the 'old' site if I delete the 'new' one - am I stark raving mad?