multiple database errors upon upgrade to 2.6.1

Hi folks,

After replacing my old files and running the upgrade script I’m getting this:

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WordPress database error: [Table ‘rsimpson_workwp.wp_categories’ doesn’t exist]
SELECT cat_ID, cat_name, category_nicename FROM wp_categories

WordPress database error: [Table ‘rsimpson_workwp.wp_post2cat’ doesn’t exist]
SELECT DISTINCT post_id FROM wp_post2cat

WordPress database error: [Table ‘rsimpson_workwp.wp_categories’ doesn’t exist]
ALTER TABLE wp_categories ADD INDEX ( category_nicename )

WordPress database error: [Unknown column ‘user_nickname’ in ‘field list’]
SELECT ID, user_nickname, user_nicename FROM wp_users

WordPress database error: [Table ‘rsimpson_workwp.wp_categories’ doesn’t exist]
SELECT * FROM wp_categories ORDER BY cat_ID

WordPress database error: [Table ‘rsimpson_workwp.wp_post2cat’ doesn’t exist]
SELECT post_id, category_id FROM wp_post2cat GROUP BY post_id, category_id

WordPress database error: [Table ‘rsimpson_workwp.wp_linkcategories’ doesn’t exist]
SELECT cat_id, cat_name FROM wp_linkcategories

Upgrade Complete

Your WordPress database has been successfully upgraded!

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Initially I tried to get back into the dashboard but it looks like it completely wiped out my database and renamed the installation to “My Blog”.

Any ideas?

Cheers,
Robert