Re: Buddypress plugin causes crash on wordpress blog
BuddyPress is a plugin that requires WordPress. It does not, nor cannot, have its own install.
Your issue is more than likely caused by your theme. It is not updated to work with BuddyPress. You need to deactivate BuddyPress. Since you cannot gain access to the admin backend, you need to drag the buddypress folder out of your /wp-content/plugins/ folder. Try logging in again. It should now be possible. Reinstall BuddyPress but do not activate until you have gone through the below process.
Here is some information on converting your WP theme to work with BuddyPress.
By the way, if you are using an older version of WP (2.9.1 or 2.9.2) you will have to click the “Activate BuddyPress Site Wide” link instead of the regular “Activate” link.