Moving Site iin FTP

I am trying to move my site from one folder to another in my company’s FTP

I put it in a subfolder http://www.domain.com/admin and i want it to be the main website: http://www.domain.com

When i move the files over, I get a bunch of error messages, it can’t find the page content, and I cannot log into the admin page.

Is there any tool I could download to fix this, or am I going to have to fix all the code in the files by hand? I am really stuck and quite frustrated at this point.

Please provide any help.
Thank you