Problem restoring localhost site

Hi all,
I was transferring site from localhost to web host. I kept getting a database connection error even though I checked and double checked config etc. Anyway, that is now the least of my worries. I decided to start from scratch in case DB was corrupted in transfer or something. I deleted all files from my folder and replaced them with copies of originals I had kept before trying the transfer. I changed the urls back to localhost/sitename in the database. My problem now is that I am getting page not found errors. I have managed to login via localhost/sitename/wp-login but the whole dashboard shows as a list view with no styling at all. If I try to access the localhost/sitename/wp-admin I get a page not found error and the url reads localhost/sitename/localhost/sitename/wp-admin etc. This makes me think it is a directory structure issue. Annoyed at myself for making quick decisions and completely stumped. Any help would be greatly appreciated.