Did you delete the plugin via the plugin admin panel, or did you just delete the files directly?
The difference is that the first way deletes the files and the database entries so that a clean install can be completed while the latter only deletes the files.
I would delete again and make sure that you do not have a database entry for wpmembers_settings and wpmembers_fields. If wpmembers_settings is there, it needs to be deleted as the install process will not install the wpmembers_fields otherwise.
If this is not the case, you can force the plugin to load all of its defaults by changing the value of $chk_force in the install file. At the beginning of wpmem_do_install in wp-members-install.php, change this line:
$chk_force = false;
$chk_force = true;
Then you can deactivate and reactivate the plugin to force the default db entries to be loaded.