Can’t delete wordpress folders to re-install?

“Install WordPress (2/3) The installation can not be completed: – You chose to install in the main directory of the domain mydomain.net, but there are conflicting filenames, therefore we can not proceed. Following filenames already exist in the main directory of the domain mydomain.net (path=”/home/admin/public_html/mydomain.net/”). You must manually remove these files before proceeding with auto-installation:¬†wp-content […]