database errors after upgrade

ok, i’m not too intelligent when it comes to code, but my host alerted users to the security issues with wordpress, so i upgraded, but now im getting all sorts of wonky database errors. theyre all over my dashboard, and when i try to post also. heres what it says when i post:

WordPress database error: [Unknown column ‘menu_order’ in ‘field list’]
INSERT INTO wp_posts (ID, post_author, post_date, post_date_gmt, post_content, post_title, post_excerpt, post_status, comment_status, ping_status, post_password, post_name, to_ping, post_modified, post_modified_gmt, post_parent, menu_order) VALUES (’38’, ‘1’, ‘2005-07-06 17:12:03’, ‘2005-07-06 21:12:03’, ‘test’, ‘testtest’, ”, ‘publish’, ‘open’, ‘open’, ”, ‘testtest’, ”, ‘2005-07-06 17:12:03’, ‘2005-07-06 21:12:03’, ‘0’, ‘0’)

Warning: Cannot modify header information – headers already sent by (output started at /home/supera2/public_html/wp-includes/wp-db.php:98) in /home/supera2/public_html/wp-admin/post.php on line 170

WordPress database error: [Unknown column ‘guid’ in ‘field list’]
UPDATE wp_posts SET guid = ‘http://superassociates.net/?p=’ WHERE ID = ’38’

the dashboard notices are essentially the same with “unknown column” stuff

i followed some advice i found on a previous thread which suggested that maybe during upload, some files were dropped, but i just went through everything and it looks ok, but i redid everything just to be sure and im still getting the messages. am i dumb or is something up?

thanks alot, and if you need some more specific info, let me know, as im relatively clueless when it comes to this stuff.

-alex