My site keeps looking all disfigured with a screwed up page then goes into a 500 internal server error.

it keeps showing this at the bottom of the page:
Apache/2.2.11 (Unix) mod_ssl/2.2.11 OpenSSL/0.9.8i DAV/2 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 Server at www.party-fouls.com Port 80

what does that mean???