Okay, changed the php code and when uninstalled - when I went to reinstall, got this message:

1062 Duplicate entry 'MODULE_SHIPPING_USPS_TYPES' for key 2
in:
[insert into configuration (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, set_function, date_added) values ('Domestic Shipping Methods', 'MODULE_SHIPPING_USPS_TYPES', 'EXPRESS, PRIORITY, FIRST CLASS, PARCEL, MEDIA, BPM, LIBRARY', 'Select the domestic services to be offered:', '6', '14', 'zen_cfg_select_multioption(array(\'EXPRESS\', \'PRIORITY\', \'FIRST CLASS\', \'PARCEL\', \'MEDIA\', \'BPM\', \'LIBRARY\'), ', now())]
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So I double checked to make sure I deleted the original PHP code, and I had. I'll check out the links dr. byte provided, and try that.