Audra when you brought your old database parts you brought the orders table with correct?
Ok you need to run this in your sql updater in ZC admin
Code:
ALTER TABLE orders ADD date_completed datetime default NULL;
ALTER TABLE orders ADD date_cancelled datetime default NULL;
ALTER TABLE orders ADD balance_due decimal(14,2) default NULL;
when you added the old tables and ran the upgrade script did you add the zen_ prefix?
If so then you will need to download the SO module and run the sql file in the zc admin sql updater, this will then add the prefix to the mix