Upgrade Issues W/ Database

Hello everyone, I recently upgraded my blog to WP v2.3 and I receive the following error when I try to save/publish a post:

WordPress database error: [Table ‘auction3_wrdp1.wp_post2cat’ doesn’t exist]
SELECT cat_ID AS ID, MAX(post_modified) AS last_mod FROM wp_posts p LEFT JOIN wp_post2cat pc ON p.ID = pc.post_id LEFT JOIN wp_categories c ON pc.category_id = c.cat_ID WHERE post_status = ‘publish’ GROUP BY cat_ID

Any ideas of how to correct this? It looks like a file added charaters to my already existing database.

Thank you in advance!