When I install Moodle27 with the windows installer all goes fine until I reach the admin profile page. When I complete this profile and save, the system seems to freeze. When I go to localhost again (on the same bowser or via another browser) I never reach the start page. After half a minute the browser complains that the number of redirects is too large.
When I download Moodle27 without the installer and overwrite the eralier moodle directory with the freshly downloaded one, the problem remains the same.