Re: delete tables start over
It looks like you used wp_ (instead of bb_) as your table prefix, and WordPress was already installed, which means bbPress tried to install into the WordPress tables?
By default, WordPress uses these tables (in 2.7):
wp_comments
wp_links
wp_options
wp_postmeta
wp_posts
wp_terms
wp_term_relationships
wp_term_taxonomy
wp_usermeta
wp_users
And bbPress uses these in the alpha version:
bb_forums
bb_meta
bb_posts
bb_terms
bb_term_relationships
bb_term_taxonomy
bb_topics
bb_usermeta
bb_users
bbPress 0.9.0.* versions used different tables:
bb_forums
bb_posts
bb_tagged
bb_tags
bb_topicmeta
bb_topics
bb_usermeta
bb_users
And when you integrate, bbPress uses the wp_users and wp_usermeta tables instead of its own bb_users and bb_usermeta.