Joomla 1.5's users table structure was this: http://www.torkiljohnsen.com/wp-content/uploads/2006/04/joomla_15_database_schema.png
And 3 is this http://docs.joomla.org/Tables/users
It looks like somewhere "rawpassword", "blog" and "newsletter" have been added to your database. My guess would be that you've installed a badly-coded extension that has changed the core database, since I can find no reference to these ever having been part of Joomla.
To narrow the problem down, I'd perhaps download your site and do a text search in the files for "rawpassword" to see if you can find the offending extension - see if there is a .sql file that adds it.
(NB For security, I would recommend you remove the username and password value fields in the error message you have posted)