Problem Saving from Write Post

Hi all,
I’ve just installed WordPress on ISS6, PHP5 and MySql 5 and although the site is up and running fine, i can’t use the save button (but i can post).

It throws up an error…
WordPress database error: [Incorrect datetime value: ” for column ‘post_date’ at row 1]
INSERT INTO wp_posts (post_author, post_date, post_date_gmt, post_content, post_content_filtered, post_title, post_excerpt, post_status, comment_status, ping_status, post_password, post_name, to_ping, pinged, post_modified, post_modified_gmt, post_parent, menu_order, post_mime_type) VALUES (‘2’, ”, ”, ‘sdf’, ”, ”, ”, ‘draft’, ‘open’, ‘open’, ”, ”, ”, ”, ”, ”, ‘0’, ‘0’, ”)

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ” at line 3]
SELECT category_id FROM wp_post2cat WHERE post_id =

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘ 1)’ at line 2]
INSERT INTO wp_post2cat (post_id, category_id) VALUES (, 1)

Warning: Cannot modify header information – headers already sent by (output started at C:\Inetpub\blog\wp-includes\wp-db.php:102) in C:\Inetpub\blog\wp-admin\post.php on line 59

Hopefully someone can help out a complete beginner!
Thanks