Urgent Help: Internal Server Error

I am using wordpress 2.5.1 for last several months. There was no problem at all. Now, all of sudden, it shows internal server error. I re-uploaded the wordpress 2.5.1 and theme but problem still continue. I checked error_log file it shows error on 9 of October.

Error Message….

[09-Oct-2008 05:52:17] WordPress database error Table ‘lasvak_blogtem.wp_ratings’ doesn’t exist for query SELECT rating_ip FROM wp_ratings WHERE rating_postid = 87 AND rating_ip = ‘74.6.22.107’ made by check_rated_ip

Same error was happened in 16 jun. Can you point the out what went wrong??