Did you assign yourself a password in File Manager Admin?

Yes and it said it saved it.
Now I can not even get into my ACP. I even disabled hooks...

Yikes. I've tried this in several browsers and it works fine for me.

What exactly happens when you try to go to adminCP?

What browser are you using?

When I login, in the upper left corner I get a little box that displayed a hook name for a DB product. When I went to the ACP I got the same box but blank. However this one I could adjust its size. I had to pull the adminfunctions file in order to get back in. Using IE under Win 8.1

I wonder if you made an error pasting in the new function print_textarea_row() in adminfunctions.php.

That isn't necessary for the File Manager, it's only for putting in a CodeMirror code editor for plugins and products. If there's a problem like a missing curly it would make a mess of a whole bunch of functions.

I was able to access the other options just could not access the manager. I uploaded the codemirror-3.0 folder to the clientscript folder.

When I edited the adminfunctions I found the file on line 999 like you mentioned. I remarked that line out and then added the code.

I guess I'll have to go try again and see if I maybe missed something...

Yea still got the same problem. Sigh...

Well re-installed from scratch and got the same results :(
The only thing I can think of is it is in some sort of debug mode or the code mirror folder is not support to get uploaded to the clientscript folder? I must be missing something...

Just skip the adminfunctions edit for now and see how it goes

Not sure what you mean when you say "remarked that line". You should change the name of the original function to something like "print_textarea_row_OLD()" or something like that and then paste the new version above it