Also happened here. The page just quit loading somewhere between the flush() at the start of the db updates and the part where it tells you your randomly selected password in install.php. That is, in the web browser, it says “Now we’re going to create the database tables and fill them with some default data.” but then craps out right there. It appears, though, that everything was correctly generated, including the sample entries and the admin user (with some password that never gets reported to the end user).
Anyway, for those who prefer doing things the painful way, the MySQL query for resetting your password (as mentioned above, but using phpMyAdmin) is as follows (just replace password with your chosen password:
update wp_users set user_pass = md5(‘password’) where user_login = ‘admin’;
Hope this helps others! – Barry
