[@mercime Participant 13 years, 4 months ago]

@hiboy just to be clear, did you upgrade from previous BuddyPress version with the old group forum installed OR is this a new install on WP 3.5.1 and BP 1.7.2? If this is a new install, then just go to admin dashboard menu Settings > Forums and go to the bottom of that page and uncheck “Enable Group Forums”