It should say on the setup page which db platform is being used. either mssql, mysql, sqlce, pgsql, sqlite or firebird. As Joe D said mojoPortal does use a database, no way it can work without one.
From what you are saying it sounds like possibly you are not uploading to the site where you think you are uploading.
also I keep unsubscribing you from forum email because email keeps bouncing back from your address.
Hope that helps,