login.php – Premature end of script

Hello. when i attempt login (login.php) after installing wp1.5, i get an error code 500 with this message: “The server encountered an internal error or misconfiguration and was unable to complete your request.”

when i check my server’s log file, it shows this: “Premature end of script headers: php-script “

any clue on how to correct this? i’m totally new to php, and i searched the forums but nothing looks quite the same as this problem that i can tell.

thanks