and when I try to reupload all WP files and reinstall, it just gives me a weird scrambled page that tells me that "it seems you've already..

installed WordPress. Please delete all old files before reinstalling" or something like that. Does anyone know what to do?

have you changed the settings on the database

in the wp-config.php file you need to make sure the database log in information is the same

it is...

'.__('You appear to have already installed WordPress. To reinstall please clear your old database tables first.').'

no idea how to do this!

delete the old database and make a new one if you can, or just make a new database with different log in information