mySQL query error: DELETE FROM acss_sessions WHERE running_time < 1280494843 or ip_address='38.107.191.95'

mySQL error: Table 'acss_sessions' is marked as crashed and should be repaired
mySQL error code: 
Date: Saturday 31st of July 2010 04:30:43 AM<center>Could not connect to mysql server. <a href='http://www.hosted-forum.com/contact.php'>Please contact Support</a></center><p>