[Zero Tolerance]

Run these DB Queries:
[sql]drop table `vb3_vbchat_datastore`[/sql]
[sql]drop table `vb3_vbchat_store`[/sql]
[sql]alter table `vb3_user`
drop vbchat_pref_font_face,
drop vbchat_pref_font_color,
drop vbchat_pref_user_ignore,
drop vbchat_pref_status,
drop vbchat_pref_auto_on,
drop vbchat_pref_auto_msg,
drop vbchat_pref_in_room;[/sql]

Change "vb3_" in all of those queries to your table prefix defined in config.php
Next step is real easy, just go through the install file and "undo" the edits you made.
They you may proceed to install fresh

- Zero Tolerance